Fluorite (Purple Fluorite in Matrix)
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Polylactic Acid) in the encyclopedia
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Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Dolomite
Dolomite (CaMg(CO3)2)
Mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Granite
Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Pink Granite
Phaneritic Acidic Plutonic Rock (primarily K-feldspar, quartz, and plagioclase)
Igneous
Calcite
Calcite (CaCO 3)
Mineral
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Aragonite (variety 'Flos Ferri')
Aragonite (CaCO3)
Mineral
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Mineral/Rock (Extraterrestrial Origin)
Pyrite
Pyrite (FeS2)
Mineral
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Coquina
Coquina (a type of limestone)
Sedimentary
Aragonite
Aragonite (CaCO3)
mineral
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Quartzite
Quartzite
Metamorphic rock
Chert (or Flint)
Chert (microcrystalline or cryptocrystalline quartz, SiO2)
Sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Quartzite
Quartzite
Metamorphic
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Sedimentary
Banded Jasper
Silicon Dioxide (SiO2)
Mineral/Sedimentary Rock (as a cryptocrystalline variety of quartz)
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
Mineral
Unidentifiable Rock Fragment
Uncertain
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Malachite
Malachite (Cu2CO3(OH)2)
mineral