Metamorphic Or Igneous Alteration

Epidote with Quartz

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Rutilated Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Prehnite

Ca2Al(AlSi3O10)(OH)2

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Ruby (Raw Corundum)

Corundum (Al2O3:Cr)

Unakite

Granitic rock composed of orthoclase, epidote, and quartz

Soapstone

Steatite

Polished dark granitoid pebble

Likely basalt or fine-grained gabbro; chiefly plagioclase and pyroxene, possibly magnetite

Epidote in Quartz

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) mixed with SiO2

Weathered quartz-bearing metamorphic rock, likely gneiss or quartzite

Quartz-rich gneiss/quartzite with feldspar, mica, and iron-oxide alteration

Blue Kyanite

Kyanite (Al2SiO5)

Green Aventurine

Quartz variety with fuchsite inclusions (SiO2)

Rhodonite

Rhodonite (Mn2+SiO3)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn pebble/nodule)

Quartz (Silicon Dioxide - SiO2)

Green Aventurine

Quartz with fuchsite inclusions (SiO2)

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Serpentine

Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Epidote

Ca2(Al,Fe)3(SiO4)3(OH)

Tiger's Eye

Quartz with riebeckite inclusions (SiO2)

Serpentine

(Mg,Fe)3Si2O5(OH)4

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Unakite Jasper

Epidotized Granite

Tumbled quartz-rich pebble, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly iron-stained milky quartz

Milky quartz

Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions

Weathered gray-green volcanic rock

Likely basaltic andesite or altered basalt; precise identification requires a fresh surface and testing

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Altered volcanic rock, possibly andesite

Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins

Prehnite with Epidote inclusions

Prehnite: Ca2Al(AlSi3O10)(OH)2; Epidote: Ca2(Al,Fe)3(SiO4)3(OH)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Soapstone (Steatite) and Quartz mix

Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)

Serpentinite (likely serpentine-rich metamorphic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite

Soapstone

Steatite (Hydrated magnesium silicate)

White Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)