Basalt (Vesicular)
Vesicular Basalt
Igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Basalt with Quartz Veins
Basalt (complex silicate) with Quartz (SiO2) intrusions
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
Igneous
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Coquina / Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Red Rhyolite Porphyry
Rhyolite (Porphyritic texture)
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Engineer Quartz/Quartzite
SiO2 (Silicon Dioxide with binders)
Sedimentary or metamorphic-derived
Basalt
Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)
igneous
Basalt
Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)
igneous
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Basalt
Basalt (primarily Plagioclase feldspar and Pyroxene)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Basalt (Fieldstone)
Basalt
igneous
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
Igneous
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt
Basalt
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Labradorite
Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)
Mineral
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Porphyritic Rhyolite
Porphyritic Rhyolite (compositionally similar to granite)
igneous
Porphyritic Andesite
Andesite (porphyritic variety)
igneous
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Lepidolite Bracelet
Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2) often in Quartz matrix
Mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous