Mineral Like Biological Tissue

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Granite (River Pebble)

Phaneritic intrusive igneous rock (Felsic)

Quartz

Quartz (Silicon Dioxide, SiO2)

Green Aventurine (Carved)

Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)

Greenstone

Metabasalt / Chlorite-Epidote Schist

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Vesicular Basalt (Scoria)

Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)

Olivine (Peridot when gem-quality)

Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Star Ruby

Corundum (Al2O3 with chromium and rutile inclusions)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)

Beryl (Aquamarine) in Matrix

Beryllium aluminum silicate (Be3Al2(SiO3)6)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Honey Calcite

Calcium Carbonate (CaCO3)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Chalcedony with Druzy Quartz Geode

Silicon Dioxide (SiO2)

Biotite (Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Chalcedony (Quartz variety)

Silicon Dioxide (SiO2)

Purple Dyed Agate Geode (Banded Chalcedony)

Silicon Dioxide (SiO2) - variety: Agate

Native Copper

Native Copper (Cu)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Moonstone with Black Tourmaline

Orthoclase (KAlSi3O8) with Schorl inclusions

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

Spiny Oyster Shell

Spondylus (Calcium Carbonate, CaCO3)

Quartz Geode

Silicon dioxide (SiO2)

Gold in Matrix

Native Gold (Au)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Quartz

Silicon Dioxide (SiO2)

Diamond

C (Carbon)

Turquoise in Matrix

Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Spessartine Garnet

Manganese aluminum silicate (Mn2+3Al2(SiO4)3)

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Blue Zircon

Zirconium Silicate (ZrSiO4)

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Clear Quartz

SiO2 (Silicon Dioxide)

Chert (Black Chert/Flint)

Chert (Silicon Dioxide, SiO2)

Sandstone (Quartzite Pebble)

Arenite (SiO2)