Mineral Based Composite

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Botryoidal Hematite (included in Quartz/Limonite matrix)

Fe2O3 (Hematite) on Quartz (SiO2) / Limonite

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

Fuchsite

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

Fuchsite

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

Lepidolite

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

Biotite Mica

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

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Biotite Mica

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

Conglomerate

Conglomerate (Sedimentary rock)

Gneiss (Metamorphic Rock)

Gneiss

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

Granite (including Pegmatite variants)

Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite (Weathered)

Granite (Felsic Plutonic Rock)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Basalt with Iron Oxidation

Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Schist

Mica Schist

Granite (specifically Pink or Alkali Feldspar Granite)

Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)

Granite

Granitoid (composition typically SiO2, Al2O3, K2O, Na2O)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Granite

Granite (a phaneritic intrusive igneous rock)

Granite

Phaneritic Felsic Igneous Rock

Diorite (River Pebble)

Intermediate plutonic igneous rock

Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)

Orbicular Quartz Diorite / Tonalite

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)