Rough Quartz (with Feldspar inclusions)
Silicon Dioxide (SiO2)
Mineral
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
Learn about Mineralized Fossil in the encyclopedia
View all →
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Granite
Felsic intrusive igneous rock
igneous
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Baryte (Barite)
Barium sulfate (BaSO4)
mineral
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Gneiss
Gneissic Metamorphic Rock
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Greenstone
Greenschist (containing chlorite, epidote, and actinolite)
metamorphic
Psilomelane (Black Hematite/Manganese Ore)
Barium Manganese Oxide (Formula: BaMn9O18(OH)4)
mineral
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Red Sandstone
Quartz Arenite (with Iron Oxide)
sedimentary
Basalt (Greenstone)
Basalt with chlorite/epidote (often referred to as Greenstone)
igneous
Red Sandstone
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Gneiss
Gneiss (High-grade Regional Metamorphism)
metamorphic
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
igneous
Bornite
Bornite (Cu5FeS4)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral