Mineral (Biogenic)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Schist

Mica Schist

Basalt (Amygdaloidal)

Amygdaloidal Basalt

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Milky Quartz

Silicon Dioxide (SiO2)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt (Mafic volcanic rock)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Sandstone

Arenite (SiO2 predominantly)

Pink Satin Spar (Satin Spar Selenite Dyed)

Gypsum (CaSO4·2H2O)

Hematite

Iron(III) oxide (Fe2O3)

Banded Gneiss

Gneiss (pronounced "nice")

Pink Granite

Phaneritic Felsic Igneous Rock

Greenschist (Greenstone)

Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)

Pyrite

Iron Pyrite (FeS2)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Moonstone (Feldspar)

Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)

Rutilated Quartz

Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)

Basalt

Basalt (extrusive igneous rock)

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Schist

Mica Schist

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

Granite

Granite (silica-rich intrusive igneous rock)

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Magnetite with Pyrite or Chalcopyrite inclusions

Magnetite (Fe3O4) with Pyrite (FeS2)

Greenschist

Greenschist (Chlorite Schist)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Granite

Granite (compositional mixture of Quartz, Feldspar, and Mica)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Diamond (set in Gold)

Carbon (C)

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

Granite

Intrusive igneous felsic rock

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)