Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Category
Igneous And Sedimentary Mixture
Browse igneous and sedimentary mixture specimens identified by the Rock Identifier community.
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Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Moss-covered)
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral