Granite
Granite
igneous
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
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Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Chert (Gravel Bit)
Microcrystalline silica (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone (likely Greywacke variant)
Arenite
sedimentary
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Granite
Granite (a plutonic igneous rock)
Igneous
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Ocean Jasper (Sea Jasper)
Spherulitic Chalcedony (SiO2)
sedimentary
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Mahogany Obsidian
Obsidian (SiO2 + Fe2O3)
igneous
Agate (or Chalcedony)
SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz
Mineral
Granite
Granite (Main minerals: Quartz SiO2, Feldspar KAlSi3O8, Mica)
igneous
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Granite
Granite
igneous
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Diamond
Diamond (C)
Mineral
Basalt
Basalt (comprising plagioclase, pyroxene, and olivine)
igneous
General Gravel (River Rock/River Stones)
Mixed Lithic Sediments (Conglomerate Clasts)
sedimentary
Diorite Gneiss
Foliated Diorite Gneiss
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Black Onyx
Cryptocrystalline Quartz (SiO2)
mineral
Amber (and Citrine Quartz)
Succinite (Amber) and Silicon Dioxide (SiO2)
Organic Mineraloid and Mineral
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Gneiss (Schistose)
Gneiss
metamorphic
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss
Gneissic Metamorphic Rock
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous