Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Category
Mineral (Synthetic Paper And Ink Polymorph)
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
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Mica Schist
Mica Schist (Muscovite subclass)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Dyed Agate
Chalcedony (SiO2)
Mineral
Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz crystals on matrix
Silicon dioxide (SiO2)
mineral
Polished ocean jasper / orbicular jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium fluoride (CaF2)
mineral
Schist
Chlorite or Mica Schist
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Schist
Mica Schist
metamorphic
Blue-green raw mineral specimen, likely apatite
Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sapphire (Raw/Rough)
Corundum (Al2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
gemstone
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Basalt with Sulfide/Pyrite inclusion
Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)
igneous
Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Schist (likely Mica Schist)
Mica Schist
metamorphic
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary