Mineral (Man Modified)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4

Emerald

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

Rock crystal quartz fragment

Quartz (silicon dioxide, SiO₂)

Azurite–malachite-bearing copper ore

Azurite (Cu₃(CO₃)₂(OH)₂) with malachite (Cu₂CO₃(OH)₂), in a copper-rich host rock

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Quartz with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with inclusions

Honey calcite (likely)

Calcite — calcium carbonate, CaCO₃

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Weathered serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, carbonate, and chromite

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Quartz Vein in Rhyolite

Silicon Dioxide (SiO2) in extrusive igneous rock

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Painted Garden Rock

Coated Siltstone or Mudstone

Quartz vein rock with iron-stained matrix

Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile serpentine-group minerals

Granite

Phaneritic plutonic rock (SiO2 rich)

Gneiss

Gneiss

Dark volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and alteration minerals

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Blue-green raw mineral specimen, likely apatite

Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Granite (likely biotite granite)

Coarse-grained felsic plutonic rock: quartz + feldspar + biotite; approximate composition SiO₂-rich

Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite/Riebeckite

Black Obsidian

Volcanic Glass (predominantly SiO2)

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Likely tumbled basalt or vesicular volcanic rock

Basalt, possibly amygdaloidal basalt

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, olivine, pyroxene, and sulfides

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)

Yellow Quartz

Silicon Dioxide (SiO2)

Garnet

Garnet group species (likely Almandine, Fe3Al2(SiO4)3)

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material

Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone

Clear Calcite

Calcite (Calcium Carbonate, CaCO3)

Likely vesicular basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase, pyroxene, and sometimes olivine

Celestite

Celestine (SrSO4)

Dark basalt or basaltic volcanic rock

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Calcite

Calcium Carbonate (CaCO3)

Native Copper

Native Copper (Cu)

Basalt

Basalt (Mafic volcanic rock)

Limonite (Iron Ore)

Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine