Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
gemstone
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite
sedimentary
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Obsidian
Obsidian (Volcanic Glass)
igneous
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Diamond
C (Carbon)
gemstone
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Raw Diamond
Carbon (C)
gemstone
Diorite
Intermediate plutonic igneous rock
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Diamond
Carbon (C)
gemstone
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Granite
Granite (a plutonic rock)
Igneous
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Silver (Jewelry form)
Native Silver (Ag)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Native Carbon (C)
mineral
Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass
Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
mineral