Igneous, Metamorphic, Sedimentary

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Tumbled Rose Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Calcite

Calcium Carbonate (CaCO3)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Specular Hematite with Quartz and Limonite

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

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Anthracite Coal

Anthracite (Carbon C)

Tumbled gneiss

Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals

Biotite (Black Mica)

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

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Tumbled Slate or Basalt Pebble

Metamorphic fine-grained rock / Slate or Phyllite

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Agate

Silicon dioxide (Chalcedony), SiO2

Tumbled Agate

Silicon Dioxide (Chalcedony / Quartz)

Tumbled Agate

Silicon dioxide (SiO2)

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Greenschist

Chlorite-actinolite schist

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Banded Gneiss

Gneiss

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Banded Slate

Slate (Metamorphosed Siltstone/Mudstone)

Yellow Calcite

Calcium Carbonate (CaCO3)

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Dalmatian Jasper

Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)

Marble

Metamorphosed Limestone (mainly CaCO3)

Greenstone / Greenschist

Chlorite schist / Epidiorite

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Dalmation Stone

Dalmation Jasper (Igneous microcrystalline quartz with arfvedsonite)

River Pebble (Quartzite)

Quartzite (SiO2)

Microcline (Potassium Feldspar)

Microcline (KAlSi3O8)

Sapphire

Corundum (Al2O3)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Yellow Sapphire

Corundum (Al2O3:Fe)

Labradorite

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8