Mineral Based Composite

Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)

Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Epidote

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

Basalt

Basalt

Dalmatian Jasper

Dalmatian Stone (Arfvedsonite/Albite Microquartz)

Epidote

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

Quartz with Mica (Micaceous Quartz)

Silicon Dioxide (SiO2) with Phyllosilicates

Fossilized Shark Tooth

Selachimorpha fossil (varies by species)

Mixed Crushed Stone

Aggregate (varied mineral composition)

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Greenschist

Greenschist (Chlorite-Epidote-Actinolite Schist)

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Vesicular Basalt with Pyrite

Basalt (MgFe2+)(Si,Al)2O6 containing FeS2 inclusions

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (mainly SiO2 with varying cements)

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Granite

Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)

Banded malachite cabochon

Malachite, Cu₂CO₃(OH)₂; the dark bands may be manganese-oxide or other sulfide-rich matrix, and could also indicate a composite or treated specimen

Schist

Mica Schist

Sandstone and River Pebbles

Sedimentary Rock (Sandstone / Quartzite / Chert)

Diorite

Intermediate Phaneritic Igneous Rock

Weathered granite (feldspathic, iron-stained granite)

Granite; primarily quartz, potassium feldspar, plagioclase feldspar, and minor mica/amphibole. Exact identification is uncertain from a single photograph.

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Breccia

Breccia (Clastic Sedimentary Rock)

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Granodiorite

Granodiorite

Gneiss (River Cobble)

Gneiss

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Epidote

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

Sandstone

Arenite (SiO2 based)

Vesicular Basalt

Vesicular Basalt

Schist

Mica Schist

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)