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Gemstone Guide

Information comes from Gemstones of Idaho written by Alice Allebaugh.

GEMSTONE OR ROCK NAME
COUNTY
LOCATION

AGATES - NODULES

Cryptocrystalline Quartz

CUSTER

• Lime Creek 12 miles south of Challis along US 93A
• Iris along Willow Creek Road off US 93A south of Challis

OWYHEE • Squaw Creek

AGATES - PLUME

Cryptocrystalline Quartz

OWYHEE • Graveyard Point southwest of Homedale (private mine) west of US 95 near Idaho-Oregon border

AGATES - GREEN & GREEN MOSS

Cryptocrystalline Quartz

BLAINE • 9 miles north of Muldoon, south of Cary, along Little Wood River
LEMHI • Parker Mountain near Salmon

AGATES - BANDED & SCENIC

Cryptocrystalline Quartz

LEMHI • South of Meyers Cove

AGATES - LIGHT BLUE

Cryptocrystalline Quartz

GEM • Near Emmett

AGATES - RED

Cryptocrystalline Quartz

CUSTER • 3 miles west of Challis

AGATES - RED & GREEN

Cryptocrystalline Quartz

OWYHEE • Eastern fringe of Succor Creek
AGATIZED WOOD CUSTER • 12 miles south of Challis along US 93A
WASHINGTON • Hog Creek 8-10 miles northwest of Weiser
AMETHYST BLAINE • Pole Creek
CUSTER • Lost River
OWYHEE • War Eagle Mountain near Silver City
• "Indian Bathtub" area
VALLEY • Paddy Flat and Big Creek area near Cascade

ANALCITE

isometric zeolite mineral; last zeolite to be deposited.

BLAINE • Golden Bell Mine in head of gulch containing Minnie Moore Mine near Bellevue
CUSTER • South of Challis

APATITE

Calcium phosphate

CUSTER • Blackbird Mining District
AQUAMARINE ELMORE • Above Atlanta

AZURITE

Copper carbonate

ADAMS • Seven Devils Mining District
CUSTER • Alder Creek and Bayhorse Mining Districts
LATAH • Hoodoo Mining District
SHOSHONE • Little North Fork area near Kellogg and Mullan
OWYHEE • South Mountain area
BERYL - GREEN LATAH • In pegmatites of the Levi Anderson, Muscovite and other mica mines near Avon
BERYL - DARK BLUE ELMORE • In primitive area near Atlanta

CALCITE - FLUORESCENT

Calcium carbonate

CUSTER • Alder Creek, Bayhorse and Yankee Fork Mining Districts

CALCITE - RHOMBOHEDRONS

Calcium Carbonate

ADAMS • White Mountain Mine, Seven Devils Mining District
BLAINE • Hailey (Mineral Hill) Mining District

CALCITE - MASSIVE / GRANULAR

Calcium Carbonate

SHOSHONE • Sunshine, Bunker Hill, Hypotheek, Hecla, Standard-Mammoth and Hercules Mines, Coeur d'Alene Mining District

CASSITERITE

Tin Oxide

LEMHI • Silver Creek
• Panther Creek near junction of Moyer Creek, Cobalt area
OWYHEE • Along Jordan Creek near Silver City

CEYLONITE

Spinel

BLAINE • Wild Horse Canyon east side of Hyndman Peak
ADAMS • Rocky Flat area near New Meadows and Seven Devils Mining District

CHABAZITE

Form of Zeolite

ADAMS • Blue Jacket Mine, Seven Devils Mining District
BOISE • Warm Springs Creek area east of Boise
ELMORE • 5 miles below Glenns Ferry
CHALCEDONY - FLUORESCENT TWIN FALLS • Rabbit Springs on Idaho-Nevada border US 93
CHALCEDONY - VARIETIES CUSTER • Willow Creek Road south of Challis off US 93A
• Mahogany Creek in Pahsimeroi Valley and near North Fork of Lost River
OWYHEE • War Eagle and Florida Mountain areas near Silver City
BLAINE • Pole Creek Summit near Galena and south of Carey along Little Wood River
LATAH • Potato Hill
LEMHI • Parker Mountain Mining District
VALLEY • Yellow Pine Mining District
CHRYSOCOLLA BENEWAH • Alder Creek
ADAMS • Arkansas Mine, et al., Seven Devils Mining District
LATAH • Hoodoo Mining District
SHOSHONE • Coeur d'Alene Mining District
CINNABAR CUSTER • Alder Creek Mining District
VALLEY • Yellow Pine Mining District
WASHINGTON • Near Weiser
CRYSTALS - COBALT LEMHI • Blackbird Mining District
OWYHEE • Silver City area
CRYSTALS - QUARTZ CUSTER • Near Bayhorse and in Yankee Fork Mining District
BENEWAH • Crystal Peak northeast of Fernwood
IDAHO • McKinley Gulch in Slate Creek and Ruby Meadows
OWYHEE • Long Gulch south of Silver City
VALLEY • Northwest of Donnelly
CORUNDUM OWYHEE • Near Silver City
CLEARWATER • Along Rhodes and Orofino Creeks near Pierce
VALLEY • Along Gold Fork Creek northeast of Donnelly
ADAMS • Rock Flat gold placers near New Meadows
IDAHO • Near (Resort) Burgdorf
DIAMONDS ADAMS • Little Goose Creek area near New Meadows

DOGTOOTH SPAR

Calcite Crystals

IDAHO • Adjacent to US 95 midway between Riggins and Lucile
EPIDOTE ADAMS • Peacock, Queen, Copper Boy and other mines, Seven Devils Mining District
CLEARWATER • Pierce area
CUSTER • Near Park Creek
LEMHI • Mackinaw and Carmen Creek Mining Districts
OWYHEE • Near Silver City
VALLEY • North of Paddy Flat Road northeast of Donnelly
• Deep Creek north of McCall
FELDSPAR - MOONSTONE CAMAS • Near Fairfield
FELDSPAR - PALE YELLOW BOISE • Shafer Creek
FELDSPAR - CLEAR FREMONT • Crystal Butte 18 miles north of St. Anthony
FELDSPAR - VARIETIES LEMHI • Blackbird Mining District
OWYHEE • Silver City area
FLUORITE - PURPLE CUSTER • Empire Mine, Alder Creek Mining District
LEHMI • South of Meyers Cove
VALLEY • Stibnite
FOSSILS - SEE ZOISITE    
GARNET - STAR BENEWAH • Purdue Creek, vicinity of Bovill and Clarkia and along East Fork of Emerald Creek (US Forest Service fee)
GARNET - LIME SILICATE ADAMS • Seven Devils Mining District
BEAR LAKE • Lanes Creek (NW 1/4, Section 9, Township 8 S, Range 43 E, BM)
CUSTER • Phi Kappa Canyon near head of Big Lost River
• Copper Basin at head of East Fork of Big Lost River
• Alder Creek Mining District near Mackay
GARNET - ROSE-RED
BROWN-RED
CLEARWATER • Rhodes Creek, Orofino area, near Clearwater River
• Pierce area
NEZ PERCE • Clearwater River near Lewiston
GARNET - RED SHOSHONE • Canyon Creek
• Purdue Creek
GARNET - PURPLE-RED OWYHEE • Silver City area
GARNET - YELLOW-GREEN WASHINGTON • Iron Mountain northeast of Weiser
GARNET - RED-PINK ADAMS • White Monument, Peacock and Copper Key mines near Kinney Point
IDAHO • On main Salmon River 10 miles above Riggins
HEDENBERGITE & ILVAITE OWYHEE • South Mountain Mining District
HEMATITE - PEBBLES BANNOCK • Lane's Creek gravel bars
BOISE • Boise Basin placers
HEMATITE ADAMS • Rock Flat on Goose Creek
CUSTER • In dumps of copper mines, Alder Creek Mining District
LATAH • Iron Mountain 20 miles north of Moscow
WASHINGTON • Iron Mountain
JADE FREMONT • Bitch Creek north of Tetonia
JASPER - RED WITH GREEN MALACHITE BEAR LAKE • Hummingbird Mine area in Paris Canyon near Montpelier
JASPER - BRUNEAU OWYHEE • 50 road miles south of Bruneau in Bruneau River Canyon
JASPER - VARIETIES BLAINE • South of Carey along Little Wood River
CUSTER • Crane Creek Reservoir area, 12 miles south of Challis along US 93A
• Alder Creek Mining District near Mackay
OWYHEE • West of US 95 south of Homedale near Idaho-Oregon border
WASHINGTON • Signal Light 10 miles northwest of Weiser
• Beacon Hill near Weiser
KYANITE SHOSHONE • Goat Mountain and Blackdome Peak area
MALACHITE ADAMS • Seven Devils Mining District
BEAR LAKE • Hummingbird Mine in Paris Canyon
CUSTER • Alder Creek Mining District
FREMONT • Skull Canyon area two miles east of Kaufman
LATAH • Hoodoo District
SHOSHONE • Coeur d'Alene and adjacent mining districts
MARCASITE LEMHI • 1 mile south of Salmon
OWYHEE • Associated with silver mines near Silver City
SHOSHONE • In the Gold Hunter Mine, Coeur d'Alene Mining District
MORDENITE CUSTER • 15 miles south of Challis
LEMHI • Near Salmon
MYRMEKITE VALLEY • Yellow Pine Mining District
NAUMANNITE CUSTER • Yankee Fork District
LEMHI • Parker Mountain Mines, Gravel Range Mining District
OWYHEE • DeLamar Mine on Florida Mountain near Silver City
OPAL - FIRE CLARK • Spencer Opal Mine near Spencer (private - fee charged)
GEM • Lava beds of Squaw Butte, Emmett area, and Black Canyon Dam
LATAH • 5 miles south of Forney on Opal Creek
OWYHEE • Near Givens Hot Springs, Oreana and on the west side of Squaw Creek
OPAL - BANDED CUSTER • 3 miles west of Challis
OWYHEE • Squaw Creek
OPAL - HYALITE NEZ PERCE • Near Lewiston area

OPAL - COLORED

GEM • Red to salmon-pink to whites and pale blues along Willow Creek near Emmett
OPAL - VARIETIES LEMHI • Pahsimeroi Valley near May
OPAL - COMMON CUSTER • Poison Creek
LATAH • Moscow Opal Mines
LEMHI • Panther Creek
• Pahsimeroi Valley near May
NEZ PERCE • Clearwater River Valley
OWYHEE • 17 miles south of Marsing
• Castle Creek
• Mule Springs
• Givens Hot Springs area
OPALIZED WOOD GOODING • Clover Creek area
LATAH • Potlatch River Canyon, Kendrick area
OWYHEE • Few miles southeast of Hwy 95 at Idaho-Oregon state line in Coal Mine Basin (black opalized wood found in sandstone formation)
PROUSTITE BLAINE • Pilgrim Mine near head of Beaver Creek
BOISE • Banner Mining District
BUTTE • Hub Mine, Lava Creek Mining District
OWYHEE • War Eagle Mountain and Florida Mountain area near Silver City
SHOSHONE • Big Creek area
PETRIFIED WOOD CUSTER • Willow Creek Road south of Challis off US 93A
• Malm Gulch area
LINCOLN • Clover Creek
OWYHEE • West of DeLamar off Jordan Valley Road
• Middle reaches East Fork of Bruneau River
• 9 miles south of Bruneau east of US 51
• Sands Basin
WASHINGTON • Manns Creek area near Weiser
• Sage Creek near Weiser
• Crane Creek area
PETRIFIED WOOD - BLACK OWYHEE • Coal Mine Basin on US 85 south of Marsing
• Middle reaches East Fork Bruneau River 9 miles south of Coal Mine Basin on US 85 south of Marsing
• Clover Creek area
WASHINGTON • Sage Creek northwest of Weiser
PYRITE BLAINE • Hailey Gold Belt
BOISE • Quartzburg area
LEMHI • Mackinaw Mining District
SHOSHONE • Coeur d'Alene Mine District
QUARTZ - CRYSTALS BLAINE • Pole Creek tributary of Little Wood River
IDAHO • Near Warren
OWYHEE • At mines near Silver City
SHOSHONE • On O'Donnell Creek near Stocking Meadows
VALLEY • Green Mountain area
QUARTZ - CLUSTERS SHOSHONE • Gem, Burke, Murray and Delta areas
QUARTZ - SMOKEY ELMORE • Dismal swamp northwest of Rocky Bar
LEMHI • Along Bandy Creek
VALLEY • Paddy Flats, Big Creek near Cascade
QUARTZ - GEODES CUSTER • Upper Valley of Lost River
OWYHEE • DeLamar Silver Mine area
WASHINGTON • Northwest of Weiser
QUARTZ - PSEUDOMORPHIC BUTTE • Lava Creek Mining District
OWYHEE • War Eagle and Florida Mountain areas near Silver City
RHODOCHROSITE KOOTENAI • Conjecture Mine south of Lakeview (REMARKS: PINK)
LEMHI • Blackbird Mining District and Kitty Burton Mine in Indian Creek District
RHODONITE ADAMS • South of New Meadows
RUBIES ADAMS • Placer deposits near New Meadows in Adams and Valley counties
CLEARWATER • Clearwater Drainage near Pierce
OWYHEE • DeLamar - Silver City area
VALLEY • Placer deposits near New Meadows in Adams and Valley counties
SAPPHIRES ADAMS • Rocky Flat area near New Meadows
CLEARWATER • Rhodes Creek near Pierce
• Orofino Creek near Pierce
VALLEY • East slope of Brundage Mountain

SILLIMANITE

Fibrolite

LEMHI • Salmon River below Salmon
NEZ PERCE • Clearwater River Valley above Lewiston
• Big Eddy of Clearwater River above Spaulding
STAUROLITE BENEWAH • 5 miles up Carpenter Creek from junction with St. Maries River
SHOSHONE • St. Joe Basin and along St. Joe - Clearwater Divide
STILBITE ADAMS • Blue Jacket Claim, Seven Devils Mining District
BLAINE • Minnie Moore Mine near Bellevue
CUSTER • North side of Galena Summit

THULITE

Pink-colored Zoisite

ADAMS • Seven Devils Mining District
THUNDER EGGS - AMETHYST LINED
WASHINGTON • Beacon Hill, Hog Creek, Weiser area
THUNDER EGGS - QUARTZ LINED BUTTE • Antelope Creek, Arco area
• Road Creek, Arco area
TWIN FALLS • Rabbit Springs, US 93 Idaho-Nevada border
TOPAZ ELMORE • Dismal Swamp 9 1/2 miles northwest of Rocky Bar
TOPAZ - BLUE VALLEY • Along tributary of Paddy Creek in Paddy Flat area on Gold Fork Creek
• Donnelly area
TOPAZ - YELLOW CLARK • Camas Creek
TOURMALINE BLAINE • South flank Hyndman Peak
BOISE • Boise Basin area
CLEARWATER • Pierce area
LATAH • Avon area
LEMHI • Blackbird Mining District

VALENCIANITE

Adularia

CUSTER • Yankee Fork District
LEMHI • Gravel Range and Parker Mountain District
OWYHEE • War Eagle and Florida Mountain near Silver City
WILLOWHITE ADA • Longhair Mine north of Eagle

ZEOLITES

CUSTER

• Various locations

An interesting group of hydrated aluminous silicates.  Occurs as amygdular fillings in vesicles in basalt or amiosite flows; also as geode filling.  Thought deposited by hot waters at time of cooling of magmas.  Various locations in Owyhee and Custer counties.

OWYHEE • Various locations
ZIRCON IDAHO • Streams draining Idaho batholith, principally the American River near Elk City
ZOISITE (FOSSILS) ADAMS • Seven Devils Mining District
ZOISITE (FOSSILS)
CAMBRIAN
BONNER • In limy rock along southeast side of Pend Oreille Lake
GOODING • West rim of Snake River Canyon near Hagerman
ZOISITE (FOSSILS)
MARINE
OWYHEE • 9 miles south of Bruneau and to right of US 51
ZOISITE (FOSSILS)
TEMPSKYA
BONNEVILLE • 13 miles northwest of Hermans on Willow Creek
ZOISITE (FOSSILS)
TRILOBITE
VALLEY • South Fork of Gold Creek
ZOISITE (FOSSILS)
GRAPTOLITES AND INVERTEBRATES
BLAINE • Trail Creek east of Sun Valley
CUSTER • Shelves of Lost River Range
• Bayhorse area north of Clayton
ZOISITE (FOSSILS)
MOLLUSKS
CUSTER • Bayhorse area
ZOISITE (FOSSILS)
FISH
CUSTER • Lost River Range near Mackay
ZOISITE (FOSSILS)
MASTODON & MAMMOTH
LATAH • In sediments of Snake River Plain as far north as Palouse Hills