Sandstone (likely Quartzose)
Arenite
sedimentary
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amazonite
Amazonite (KAlSi3O8, a triclinic variety of Potassium Feldspar)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Sandstone (likely River-tumbled Picture Sandstone)
Arenite (predominantly SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Chert (and Limestone Pebbles)
Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Cream River Jasper
Silicified microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil
Geode (Unopened)
Silica-rich concretion (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Chalcedony (specifically Blue Chalcedony or Common Opal variety)
Silicon Dioxide (SiO₂)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid