Mineral Based Alloy (Anthropogenic)

Mica Schist

Mica Schist (Complex Silicate Rock)

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

Flower Agate (Cherry Blossom Agate)

Chalcedony (SiO2) with Opaque Inclusions

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Granite

Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)

Granite Pebble

Phaneritic Felsic Igneous Rock

Granite (Pink/Potassium Feldspar rich)

Granite (K-feldspar rich intrusive igneous rock)

Basalt with Magnetite inclusions

Basalt (Mafic silicate rock) potentially containing Magnetite (Fe3O4)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Schist

Mica Schist

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

Basalt Pebble

Aphanitic Mafic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Raw Citrine

Citrine (Silicon Dioxide, SiO2)

Granite

Phaneritic Felsic Igneous Rock

Lepidolite

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

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Labradorite

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

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Schist

Mica Schist

Quartz (Commonly referred to as a River Rock or Quartzite Pebble)

Silicon Dioxide (SiO2)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Mica Schist

Muscovite/Biotite Schist

Obsidian

Obsidian (volcanic glass)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Basalt

Mafic Igneous Rock

Granite

Phaneritic Felsic Igneous Rock

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Aquamarine with Quartz

Beryl (Be3Al2Si6O18) with Quartz (SiO2)

Dendritic Agate

Chalcedony (SiO2) with manganese/iron oxide inclusions

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite - Lithium-rich Mica)

Mica (Muscovite)

Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2

Basalt

Mafic volcanic rock (primarily Plagioclase and Pyroxene)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone (with Chert/Quartzite)

Arenite (primarily SiO2)