Mineral Based Composite

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Granite

Granite (Phaneritic Quartz-Feldspar-Biotite rock)

Quartz-veined Gneiss

Gneiss with Quartz (SiO2) intrusions

Dinosaur Bone (Gembone)

Agatized Dinosaur Bone (Silicified Paleo-osteoid)

Pink Lepidolite

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

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Basalt with Quartz/Calcite Veining

Basalt (principally Plagioclase and Pyroxene)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Lepidolite in Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 / SiO2

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Biotite (Black Mica)

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

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Bismuth Crystal

Bismuth (Bi)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Blue Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Basalt with Quartz/Calcite matrix

Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Aquamarine

Beryl (Be3Al2Si6O18)

Muscovite Mica Schist

Metamorphic Rock (Muscovite-Biotite Schist)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Orpiment (As2S3) and Realgar (As4S4)

K2 Jasper (K2 Granite)

Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)

Lepidolite on Pegmatite

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

Lepidolite in Mica Schist

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

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Mica schist

Mica schist (Muscovite and Biotite group)

Lepidolite

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

Lepidolite

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

Glauconite (Green Sandstone)

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Biotite Schist

Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]

Hawk's Eye / Pietersite (Tiger's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Porphyritic Basalt (with Quartz or Calcite inclusion)

Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)

Sandstone Cobble with Iron Staining

Arenite with Limonite/Hematite staining

Chert (Nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Mica Schist

Mica Schist (Muscovite subclass)