Man Made Metamorphic Style Composite

Sandstone

Clastic sedimentary rock (primarily SiO2)

Basalt

Basalt (containing plagioclase, pyroxene, and olivine)

Quartzite

Metamorphic Rock (composed mainly of SiO2)

Quartzite (River Cobble)

Metamorphic Rock (composed predominantly of SiO2)

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Diamond

Carbon (C)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Limestone

Sedimentary Rock (Primarily CaCO3)

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Aventurine

Silicon Dioxide (SiO2) with inclusions

Sandstone

Arenite (variable SiO2 composition)

Diamond

Carbon (C)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Unakite

Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)

Quartzite

Quartzite (primarily composed of SiO O₂)

Diamond

Carbon (C)

Quartzite Pebble

Metamorphic Rock (composed mainly of SiO2)

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Diamond

Carbon (C)

Chalk

Calcium Carbonate (CaCO3)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Pearl

Aragonite (CaCO3 with conchiolin)

Raw calcite specimen

Calcite, calcium carbonate (CaCO₃)

Diamond (faceted)

Diamond (Pure Carbon, C)

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with sulfide minerals

Diamond (in a jewelry setting)

Cubic Carbon (C)

Quartz (milky quartz), possibly calcite

Quartz: SiO₂; visual identification is uncertain because the specimen is wet and lacks diagnostic crystal faces

Milky quartz

Quartz, silicon dioxide (SiO₂)

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Basalt cobble

Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides

Quartzite pebble

Metamorphic rock dominated by SiO2 (Quartz)

Diamond

Carbon (C)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Pearl

Calcium Carbonate (CaCO3) with Conchiolin