Coquina
Coquina (Bioclastic Limestone)
sedimentary
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
Learn about Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration) in the encyclopedia
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Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Eclipse Stone (Kabamba Jasper)
Rhyolite with Aegirine (NaFe3+Si2O6)
metamorphic
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Amethyst
Silicon Dioxide (SiO2)
mineral
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Ferro-slag (Leland Blue/Slag Glass)
Anthropogenic Vitreous Silica (Industrial Slag)
igneous
Milky Quartz with Iron Oxide Weathering
Silicon Dioxide (SiO2) with Goethite/Limonite coatings
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral
Gneiss (River Cobble)
Gneiss
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Basalt (Weathered River Pebble)
Extrusive Igneous Rock
igneous
Citrine
SiO2 (Silicon Dioxide)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gravel Pebble (Likely Quartzite or Basalt)
Quartzite (or Macrocrystalline Quartz)
metamorphic
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Serpentine
Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Leopardite
Quartz porphyry / Quartz monzonite with manganese oxide spots
igneous
Gneiss
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Gneiss
Granitic Gneiss
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Greenschist
Greenschist (Actinolite-Chlorite Schist)
metamorphic
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Possible basaltic volcanic rock or iron-rich meteorite
Likely basalt (plagioclase–pyroxene rock); meteorite status cannot be confirmed visually
igneous
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic