Milk Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Kyanite (Green and Blue varieties)
Kyanite (Al2SiO5)
mineral
Chalcedony
Chalcedony (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Rose Quartz and Milky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet group (X3Y2(SiO4)3)
mineral
Diamond
Carbon (C)
mineral
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
N/A (Non-Geological Object)
N/A
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Banded Sandstone (Differential Weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Chalcedony
Silicon Dioxide (SiO₂)
mineral
Yellow Quartz / Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Native Carbon (C)
mineral
Quartzite
Quartzite
Metamorphic
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Kunzite (Spodumene)
Spodumene (LiAlSi2O6)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Orange Calcite (Polished Sphere)
Calcium Carbonate (CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Magnetite with Serpentine
Magnetite (Fe3O4) in Serpentine Matrix
mineral
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Banded Gneiss
Gneiss
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Diamond
Native Carbon (C)
mineral
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)
metamorphic