Porphyritic Andesite
Andesite (Porphyritic texture)
igneous
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
Banded River Pebble (Gneiss or Quartz-Veined Basalt)
Polished River Siltstone or Quartzite Gneiss
metamorphic
Quartzite with Quartz Vein
Quartzite (SiO2)
metamorphic
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Bicolor Quartz Pebble
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Fluorite with Rhodochrosite
Fluorite (CaF2) and Rhodochrosite (MnCO3)
Mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Dyed Blue Quartzite
SiO2 (Silicon Dioxide) with artificial colorants
metamorphic
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
mineral
Chert (Jasper-bearing)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz Druzy on Agate
Silicon Dioxide (SiO2)
mineral
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral
Quartzite with Iron Inclusions
Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper Beach Pebble
Silicon Dioxide (SiO2) - Macro-crystalline Quartz
sedimentary
Chert (and Flint nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Diorite (with Iron Staining)
Phaneritic Intermediate Igneous Rock
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Mineral
Basalt (Arrowhead form)
Extrusive mafic igneous rock
igneous
Beryl (var. Heliodor or Aquamarine)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Blue Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz (Milky Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with native Au)
mineral
Lake Superior Agate
Silicon Dioxide (SiO2) with iron impurities
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Brown Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary