Mineral

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt (Mafic volcanic rock)

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (pronounced "nice")

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

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.

Sandstone

Arenite (SiO2 predominantly)

Hematite

Iron(III) oxide (Fe2O3)

Pink Satin Spar (Satin Spar Selenite Dyed)

Gypsum (CaSO4·2H2O)

Moonstone (Feldspar)

Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)

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)

Basalt

Basalt (extrusive igneous rock)

Rutilated Quartz

Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)

Peach Aventurine

Quartz variety (SiO2 + Hematite/Goethite inclusions)

Pyromorphite on Epidote

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

Greenschist

Greenschist (Chlorite Schist)

Granite

Granite (silica-rich intrusive igneous rock)

Schist

Mica Schist

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Granite

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

Milky Quartz (Water-Worn Pebble)

Silicon Dioxide (SiO2)

Magnetite with Pyrite or Chalcopyrite inclusions

Magnetite (Fe3O4) with Pyrite (FeS2)

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Clear/White Quartz (Rock Crystal)

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)

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Granite Cobble

Felsic Intrusive Igneous Rock (Granite)

Granite

Intrusive igneous felsic rock

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Granite

Granite (comprised primarily of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica (KAl2(AlSi3O10)(OH)2))

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)