Clear Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Or Igneous Alteration
Browse metamorphic or igneous alteration specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (with potential iron inclusions)
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (KAlSi3O8), specifically the variety showing adularescence
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Moonstone (specifically Cat's Eye or Gray Moonstone)
Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Milky Quartz (Water-worn Pebble)
Quartz (Silicon Dioxide) - SiO2
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borosilicate (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Garnet (specifically Almandine or Pyrope)
Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Moonstone (Feldspar)
Orthoclase feldspar, (K,Na)AlSi3O8
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate (Yellow Agate)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral