Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Category
Mineral Pseudomorph
Browse mineral pseudomorph specimens identified by the Rock Identifier community.
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Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Rock Fragment with Calcite/Quartz Vein
Polymictic Rock Fragment (SiO2 / CaCO3)
igneous
Basalt with Epidote (Flowerstone-like texture)
Amygdaloidal Basalt (silicate mineral inclusions)
igneous
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Copper Ore Specimen with Malachite
Cuprite, Malachite, and Limonite matrix
mineral
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Geode
Quartz / Chalcedony nodule
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Amethyst
Silicon Dioxide (Quartz variety)
gemstone
Agate Nodule / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chevron Amethyst
Silicon Dioxide with Iron Impurities (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Quartz (SiO2)
mineral
Amethyst
Quartz (SiO2)
gemstone
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Chalcedony
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony / Agate Nodule
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Mica Schist with Quartz and Muscovite
Muscovite-Quartz Schist
metamorphic
Amethyst Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Bumblebee Jasper
Anhydrous Calcium Carbonate with Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Basalt with Large Augite Phenocrysts
Porphyritic Basalt (containing Ca(Mg,Fe,Al)(Al,Si)2O6)
igneous
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Quartz (Raw / Unpolished)
Silicon Dioxide (SiO2)
mineral