Igneous Or Mineral

Granite Pebble

Intrusive Igneous Rock

Epidote

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

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron sulfide (FeS2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Biotite (Black Mica)

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

Fluorite

Calcium Fluoride (CaF2)

Tumbled Moonstone

Feldspar (Orthoclase/Albite), KAlSi3O8

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Magnetic Sand Grain / Magnetite Pellet

Magnetite (Fe3O4)

Arfvedsonite (often mistakenly sold as Astrophyllite)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Quartz fragment

Silicon Dioxide (SiO2)

Weathered vesicular basalt (likely amygdaloidal basalt)

Basalt, chiefly plagioclase and pyroxene with possible olivine; cavities may contain secondary zeolites, calcite, or silica

Granite Pebble

Intrusive Igneous Rock (Quartz, Feldspar, Mica)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Granite

Intrusive Igneous Rock

Granite

Plutonic Igneous Rock

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Granite Pebble

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Blue Aventurine

Quartz (SiO2) with inclusions

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Milky Quartz with Mica Matrix

SiO2 (Silicon Dioxide) with Muscovite/Biotite mica

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Chalcopyrite in Quartz matrix

Chalcopyrite (CuFeS2) with secondary Malachite (Cu2CO3(OH)2)

Pyrite

Iron Disulfide (FeS2)

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))

Microcline Feldspar

KAlSi3O8

Green-speckled igneous rock, likely epidote-bearing basalt or serpentinite

Tentatively epidote-bearing basalt (compositionally uncertain from the image)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Optical Calcite

Calcium Carbonate (CaCO3)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Yellow Calcite

Calcium Carbonate (CaCO3)