Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
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.
Learn about Mineral, Often A Rock Given Its Aggregate Nature in the encyclopedia
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Gold Mineral
Native Gold (Au)
mineral
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt with Iron Oxidation
Extrusive Igneous Rock (Mafic)
igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
sedimentary
Black Tourmaline (Schorl) on Quartz
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Chalcedony (possibly agate or common quartz)
Microcrystalline quartz, SiO₂
mineral
Red Sandstone Pebble
Arenite (Quartz Sandstone / Hematitic Sandstone)
sedimentary
Burmese Amber (Burmite)
Burmite (C10H16O)
mineraloid
River Cobble (Quartzite or Gneiss)
Metamorphic crystalline rock (predominantly SiO2 based)
metamorphic
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Quartz (Druzy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Red Jasper (River pebble)
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary/mineral
Picture Jasper
SiO2
mineral
Basalt (Vesicular)
Extrusive igneous rock with vesicular texture
igneous
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Engineerged Quartz (Quartz Composite)
SiO2 (Silicon Dioxide) in a polymer resin matrix
mineral
Chrysocolla (carved)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Yellow Quartz
SiO2 (Crystalline Silicon Dioxide)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Sandstone / Siltstone
Sedimentary Rock (Quartzose Sandstone / Siltstone)
sedimentary
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 dominant composition)
sedimentary
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Picture Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Pink Quartz Grains
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (complex sodium iron aluminum borosilicate)
mineral