Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
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Citrine Quartz
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
Mineral
Citrine
SiO2 (Silicon Dioxide)
Mineral
Tumbled honey calcite
Calcite (CaCO₃), likely iron-stained variety
mineral
Red Spinel
Spinel (MgAl2O4)
mineral
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Iron-stained milky quartz
Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals
mineral
Orange Quartz with Hematite inclusions
Quartz (SiO2) with Hematite (Fe2O3) inclusions
Mineral
Rutilated Quartz (beads)
SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)
Mineral
Ocean Jasper
Orbicular Jasper (variety of Chalcedony - SiO2)
Mineral
Amethyst cluster
Quartz, SiO₂; purple coloration is caused mainly by iron-related defects and natural irradiation
mineral
Rutilated Quartz
SiO2 with TiO2 inclusions (Rutile)
Mineral
Ferruginous Quartz (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary (secondary classification for a weathered mineral specimen)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Rutilated Quartz
Quartz (SiO2) with Rutile inclusions (TiO2)
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Pyrite
Pyrite (FeS2)
Mineral
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Kunzite
Spodumene (LiAlSi2O6), variety Kunzite
Mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Zircon
Zircon (ZrSiO4)
Mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Galena
Galena (Lead Sulfide), PbS
mineral
Ruby
Corundum (Al₂O₃) with Chromium (Cr)
Mineral (gemstone)
Pyrite
Pyrite (FeS₂)
Mineral
Mica (likely Muscovite)
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Not a geological specimen
N/A (man-made object)
N/A
Desert Rose (Gypsum Rose / Barite Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions
mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Feldspar-rich igneous rock, likely granite or gneiss fragment
Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Note: Item is not a geological specimen
n/a
none
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue