Metamorphic Or Igneous Alteration

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

Emerald

Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz with Iron Staining)

Silicon Dioxide (SiO2)

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2

Epidote

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Gold Ore

Native Gold (Au) in Matrix

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Ruby (Pink to Red Corundum)

Al2O3 (Corundum with Chromium impurities)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Blue Sapphire

Corundum (Al2O3 with trace Titanium/Iron)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Nephrite Jade

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

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Dumortierite Quartz

Dumortierite (Al7BCuO15)

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Epidote

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

Epidote

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

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Jade

There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.

Parti Sapphire

Corundum (Al2O3)

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Serpentine

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

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

White Jade (Nephrite)

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

Nephrite Jade

Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)