Lepidodendron Plant Fossil
Lepidodendron sp. (Lycopodiophyta)
fossil
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous (Context Dependent) in the encyclopedia
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Schist (Biotite/Mica Schist)
Medium-grade regional metamorphic rock (rich in Phyllosilicates)
metamorphic
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Porphyry
Porphyritic Andesite/Basalt
igneous
Rose Quartz
Silicon Dioxide (SiO2) containing trace amounts of titanium, iron, or manganese
mineral
Chert (Flint variety)
Microcrystalline context of Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Eudialyte in Matrix
Na15Ca6(Fe,Mn)3Zr3(Si,Nb)(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Blue Sapphire
Corundum (Al2O3)
gemstone
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mineral
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Weathered granite (likely with accessory quartz)
Granite; chiefly quartz, K-feldspar, plagioclase, and biotite/hornblende
igneous
Emerald
Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities
mineral
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Auriferous Quartz or Pyritic Ore
Iron Pyrite (FeS2) or Native Gold (Au) in Matrix
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper
Jasper, an opaque microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral inclusions
gemstone
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
sedimentary
Diamond and Sapphire
Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)
gemstone
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Ruby (Pink to Red Corundum)
Al2O3 (Corundum with Chromium impurities)
mineral