Mineral Based Composite

Corundum (Sapphire/Ruby in Matrix)

Aluminium oxide (Al2O3)

Biotite on Quartz

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

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Biotite (Black Mica)

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

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Bismuth Crystal

Bismuth (Bi)

Celestite (Celestine)

Celestine (Strontium Sulfate, SrSO4)

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Mica Schist

Schist (muscovite-biotite schist)

Chert (variously known as Flint or Microcrystalline Quartz)

Silicon dioxide (SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Dragon Stone

Ohko Stone (Argillaceous sedimentary rock)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Pegmatite containing Muscovite and Quartz

Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Ferruginous Sandstone Pebble

Iron-rich Clastic Sedimentary Rock

Quartz / Limestone Gravel

SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)

Basalt (Vesicular or Porphyritic River Pebble)

Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)

Polished labradorite

Labradorite, calcium-rich plagioclase feldspar (approximately Ca0.5–0.7Na0.5–0.3Al1.5–1.7Si2.5–2.3O8)

Citrine Quartz (Tumbled)

Silicon Dioxide (SiO2)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with inclusions of Hematite

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Schist

Mica Schist

Vesicular basalt (probable)

Basalt; chiefly plagioclase feldspar, clinopyroxene, and iron-rich minerals, with vesicles possibly lined by zeolites or calcite

Sandstone (lithic wacke/arenite)

Clastic sedimentary rock (SiO2 + varied clasts)

Basalt

Mafic Extrusive Igneous Rock

Granitic Pegmatite with Muscovite Mica

Pegmatite (containing KAl2(AlSi3O10)(OH)2)

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Gneiss

Gneiss (Foliated Metamorphic Rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Greenstone

Metabasalt / Greenschist facies rock

Dalmatian Stone

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)

Weathered mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, clinopyroxene, and commonly olivine or magnetite

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)