Fluorite
Calcium Fluoride (CaF2)
mineral
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
Red Coral
Corallium rubrum
mineral
Stainless Steel Spoon
Iron-Chromium Alloy (Fe + Cr + Ni)
mineral-based human-made alloy
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Olivine
Olivine group (Mg, Fe)2SiO4
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Porphyritic Basalt or Diabase with Plagioclase Phenocrysts
Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar
Igneous
Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
sedimentary
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (variations include Flint or Jasper)
Chert (SiO2)
sedimentary
Serpentine (Serpentinite)
Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Coal (most likely Bituminous or Anthracite)
Coal (primarily composed of carbon with varying amounts of other elements)
Sedimentary rock