Sedimentary Or Metamorphic (Base Substrate)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Labradorite

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

Labradorite

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

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Quartzite Cobble (Iron-stained)

Quartzite (SiO2)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Mystic Topaz (Treated Quartz or Topaz)

Silicate Mineral (SiO2 or Al2SiO4(F,OH)2) with Titanium coating

Fuchsite

K(Al,Cr)2(AlSi3)O10(OH)2

Epidote

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Sandstone

Arenite (SiO2 based)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Mica schist (likely biotite–muscovite schist)

Mica schist; chiefly quartz (SiO₂) plus muscovite and biotite mica, with possible garnet or graphite

Raw Sapphire (Corundum)

Aluminum oxide (Al2O3)

River Pebble

Weathered Rock Fragment

Quartzite with Calcite Accretion

Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)

Gneiss

Gneiss

Biotite-bearing gneiss or schist

Quartz–feldspar–mica metamorphic rock, likely mica schist/gneiss

Sandstone

Arenite (SiO2 based)

Yellow Beryl

Beryl (Be3Al2(SiO3)6)

Red Quartzite

Metamorphic Quartzite (SiO2)

Epidote (likely Unakite component or Epidosite)

Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Jasper

Silicon dioxide (SiO2)

Epidote

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

Citrine

Silicon dioxide (SiO2)

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3

Labradorite

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

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Garnet Schist

Almandine-Muscovite Schist

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Biotite Mica

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

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Quartzite

Quartzite (mostly SiO2)

Botryoidal Chalcedony

Chalcedony (SiO2)