Blue Quartz (Dumortierite Quartz)
Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Quartzite with Quartz Vein
Quartzite (primarily SiO2)
metamorphic
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite
mineral
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Jasper (likely Lake Superior Jasper)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Tiger's Eye
SiO2 (Silicon Dioxide with iron inclusions)
Mineral
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral
Tiger's Eye (Blue/Golden mix)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
River Rock (Quartzite)
Quartzite (SiO2)
metamorphic
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Granite
Phaneritic Granocrystalline Igneous Rock
igneous
Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)
metamorphic
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Basalt
Extrusive Mafic Igneous Rock
igneous
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Onyx Marble (also commonly called Onyx)
Calcite (CaCO3), often with other mineral impurities
Sedimentary Rock (specifically a type of Travertine)
Schist
Schist (various mineral compositions)
Metamorphic
Red Quartzite
Quartzite (primarily SiO2 with trace Fe2O3)
metamorphic
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Tiger's Eye (Small Polished Bead)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz (Aura Quartz)
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile Inclusions (TiO2)
Mineral
Charoite
Charoite - K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Diamond
Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.
Mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral