Greenschist
Greenschist facies rock
Metamorphic
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Diamond
Diamond (C)
Mineral
Red Jasper
Jasper (a variety of Quartz, SiO2)
Mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Smoky Quartz (Chlorite Inclusions)
Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Leopard Skin Jasper
Chalcedony (cryptocrystalline Quartz)
Mineral
Orange Calcite (likely polished specimen)
Calcite
Mineral
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Diamond
Diamond (C)
Mineral
Fluorite (Purple Fluorite in Matrix)
Fluorite (Calcium Fluoride, CaF2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)
Fluorite (CaF2)
Mineral
Topaz
Topaz (Al2SiO4(F,OH)2)
Mineral
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.