Fluorite (Rainbow Fluorite Tower)
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Likely polished leopard-skin jasper or brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone
sedimentary
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Carnelian Agate Beads
Silicon Dioxide (SiO2)
gemstone
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Tumbled rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Blue lace agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
mineral
Tumbled chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert
mineral
Quartzite
Quartzite (predominantly SiO2)
metamorphic
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Amazonite
Microcline feldspar (KAlSi₃O₈), green variety
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral impurities
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Basalt (with Porphyritic/Vesicular texture)
Extrusive mafic igneous rock
igneous
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Dark glassy pebble, possibly volcanic rock
Likely basalt or volcanic glass (var. obsidian), unconfirmed from image
igneous
Tumbled chalcedony (likely blue-gray agate)
Cryptocrystalline quartz, SiO₂; chalcedony/agate variety
mineral
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Black-and-white jasper
Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions
metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble (Tumbled Quartzite)
Silicon Dioxide (SiO2)
mineral
Yellow Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Rubellite Tourmaline
Elbaite Tourmaline, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
gemstone
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Iron-stained weathered stone (tentative)
Undetermined; possibly weathered iron-rich basalt or concretion
mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Weathered sandstone fragment
Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic ZrO₂), possibly glass or quartz
gemstone