Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Category
Metamorphic (Man Made)
Browse metamorphic (man made) specimens identified by the Rock Identifier community.
River Pebbles (Sandstone and Quartzite)
SiO2 (Quartz) dominated clastic rocks
sedimentary and metamorphic
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Anthracite Coal
High-rank coal (primarily Carbon, C)
metamorphic
Quartz (pebble)
Quartz (SiO₂)
Mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Marble
Metamorphosed Limestone/Dolomite
metamorphic
White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Green Calcite
Calcite (CaCO3)
mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
mineral
Bi-Color Tourmaline (or Watermelon Tourmaline)
Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)
Mineral
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral
Corundum
Corundum (Al2O3)
Mineral
Rose Quartz
Quartz (SiO2) with trace elements of titanium, iron, or manganese
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral