Metamorphic Or Igneous Alteration

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Polished serpentine or serpentinite pebble

Serpentinite; principally serpentine-group minerals (antigorite, lizardite, chrysotile), Mg₃Si₂O₅(OH)₄

Stichtite in Serpentine (Atlantisite)

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

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Polished dark granitoid pebble

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

Fuchsite Quartzite (Aventurine / Verdite)

Quartzite with Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2 matrix)

Nephrite Jade

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

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Metal-rich sulfide ore, likely galena-bearing rock

Galena (PbS) with pyrite/chalcopyrite in a host rock; exact identification requires testing

Epidote in Quartz

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

Likely weathered quartz-bearing rock (uncertain identification)

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

Epidote

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

Gabbro with quartz/feldspar veins

Gabbro, likely with leucocratic quartz–feldspar pegmatitic material

Tumbled quartz-rich pebble, likely milky quartz

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

Quartz vein rock

Milky quartz with smoky quartz; chiefly silicon dioxide (SiO₂)

Blue Kyanite

Kyanite (Al2SiO5)

Green Aventurine

Quartz variety with fuchsite inclusions (SiO2)

Rhodonite

Rhodonite (Mn2+SiO3)

Greenish rough stone, possibly serpentine or soapstone

Indeterminate from the image; possible serpentinite (serpentine-group minerals) or talc-rich soapstone

Unakite

Granitic rock composed of orthoclase, epidote, and quartz

Soapstone

Steatite

Tumbled dark green stone, likely serpentine or greenstone

Serpentinite (serpentine-group minerals), possibly chlorite- or amphibole-rich greenstone

Tumbled serpentine with magnetite/chromite veining

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with opaque magnetite or chromite

Sandstone (Micaceous Sandstone)

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

Milky quartz

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

Serpentine

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

Green Aventurine

Quartz with fuchsite inclusions (SiO2)

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

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

SiO2 (Quartz) with associated ferromagnesian minerals

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Tumbled magnetite-bearing rock, likely basalt or gabbro

Magnetite (Fe₃O₄) in a mafic silicate matrix, probably basaltic or gabbroic

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Tumbled greenish quartzite or serpentine

Quartzite (mostly SiO₂) or serpentine-group rock

Unakite Jasper

Epidotized Granite

Serpentine

(Mg,Fe)3Si2O5(OH)4

Fuchsite

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

Tiger's Eye

Quartz with riebeckite inclusions (SiO2)

Tumbled green stone, likely serpentine or nephrite jade

Serpentine-group minerals (commonly antigorite/lizardite), possibly nephrite jade (intergrown tremolite–actinolite)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Prehnite with Epidote inclusions

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