Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Category
Industrial Byproduct (Anthropogenic Rock)
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Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Green Aventurine (Quartz)
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Anthracite Coal
Anthracite
metamorphic
Tiffany Stone
Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)
metamorphic
Graphic Granite
Graphic Granite (a variety of Pegmatite)
igneous
Weathered granitic rock
Granite, likely quartz–feldspar–mica aggregate
igneous
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Basalt with Quartz Vein
Basaltic rock with hydrothermal SiO2 filling
igneous
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Pumice
Pumice (Amorphous volcanic glass)
Igneous
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase phenocrysts)
igneous
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Tumbled jasper or chalcedony pebble
Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining
mineral
Sapphire
Corundum (Al2O3)
mineral
Quartz Crystal (Rough)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Mica inclusion
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
igneous
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Garnet Schist
Almandine Garnet Schist
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Red Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Opalite
Man-made opalized glass
mineral
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Conglomerate
Conglomerate Rock
sedimentary