Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Quartz Geode (River Cobble)
Silicon Dioxide (SiO2)
mineral
Chalcedony Nodule (Commonly known as Agate or Chert)
Microcrystalline Quartz (SiO2)
mineral
Bicolor Quartz Pebble
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Quartzite with Quartz Vein
Quartzite (SiO2)
metamorphic
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Granite (Pink/Potassium-rich)
Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Green Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Labradorite
Labradorite ((Ca,Na)(Al,Si)4O8)
mineral
Basalt (Weathered/Tumbled)
Extrusive Mafic Igneous Rock
igneous
Ambergris (Sea Wax)
Physeter macrocephalus fecalith
Organic geological/oceanic specimen
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Lapis Lazuli
Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (SiO2)
sedimentary
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Granite Cobble
Granite (Felsic Plutonic Rock)
igneous
Chert (specifically Chalcedony/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Felsic Intrusive Igneous Rock
igneous
Chert (Arrowhead Preform or Flake)
Microcrystalline Quartz (SiO2)
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Chrome-Mica (KAl2(AlSi3O10)(OH)2)
metamorphic
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Metamorphic/Igneous (Hydrothermal)
Abbey Bominable (Monster High character)
Anthropomorphic Yeti / Digital Animation
not a rock (animated character)
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gold-bearing Quartz with Pyrite
Quartz (SiO2) with Gold (Au) and Pyrite (FeS2)
mineral
Chert Pebble
Microcrystalline silica (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary