Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide impurities
sedimentary
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (lithified sand)
sedimentary
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Schist
Schist (various compositions)
metamorphic
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Red Jasper (River pebble)
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities
sedimentary (chemical)
Blue Lace Agate (Variety of Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper silicates (Cu, Al)2H2Si2O5(OH)4·nH2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Sandstone (Green/Yellow Siltstone variant)
Arenite or Siltstone (primarily SiO2 with mineral staining)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral