Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Category
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Basalt-Amugydule (Amygdaloidal Basalt)
Aphanitic Mafic Igneous Rock with Vesicle Infillings
Rock Salt (Halite)
Halite (Sodium Chloride, NaCl)
Orange Calcite (likely polished specimen)
Calcite
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
Hematite
Iron(III) oxide (Fe2O3)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Druzy Quartz (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
Peridot
Olivine (Mg, Fe)2SiO4
Quartz Geode
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
Not a geological specimen
N/A (man-made object)
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
Cloudy Quartz (or Milky Quartz)
Silicon Dioxide (SiO2)
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
Unable to identify - Image contains non-geological items
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
Schist
Mica Schist
Barite (Desert Rose or Cockscomb variety)
Barium Sulfate (BaSO4)
Quartz (Tumbled/Polished Pebble)
Silicon Dioxide (SiO2)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)