Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Agate (Plume/Moss variety)
Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Kunzite (Pink Spodumene)
Spodumene, LiAl(SiO3)2
mineral
Gold Nugget
Native Gold (Au)
Mineral
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Cloudy Quartz with Mica inclusions
Silicon Dioxide (SiO2) with accessory Muscovite KAl2(AlSi3O10)(OH)2
mineral
Specular Hematite
Hematite (Iron Oxide, Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz (Iron-stained or Ferruginous Quartz)
Silicon Dioxide (SiO2)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC) / Moissanite (natural)
mineral
Sardonyx Cameo
Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz
Mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Tree Agate
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Quartz
Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Moonstone (Rainbow Moonstone)
Labradorite (White Labradorite) - (Na,Ca)(Al,Si)4O8
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2 (Sodalite)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Petrified Wood
Silicified Wood (SiO2)
mineral
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Banded Agate / Lace Agate
Agate (Silica/Quartz) - SiO2
mineral
Greenschist (Greenstone)
Chlorite Schist / Greenschist Facies Rock
metamorphic
Snowflake Obsidian
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz
Mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Pink Granite (with Potassic Feldspar and Quartz)
Felsic Intrusive Igneous Rock (Granite)
igneous
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber