Orthoclase Feldspar (or K-Feldspar)
Orthoclase (KAlSi3O8)
Mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
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Amethyst (Raw Cluster)
Silicon Dioxide with iron impurities (SiO2)
mineral
Quartz (milky variety)
SiO2 (Silicon Dioxide)
Mineral
Quartz
Quartz (SiO2)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Amethyst
Amethyst (a variety of Quartz, SiO2)
Mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Citrine Quartz
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
Mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Moonstone
Adularia (orthoclase feldspar variety)
mineral
Quartz
Quartz (SiO₂)
Mineral
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Mica (likely Muscovite)
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Black Tourmaline
Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Rutilated Quartz (beads)
SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)
Mineral
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Zircon
Zircon (ZrSiO4)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Biotite Mica
K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2
Mineral
Obsidian
Obsidian (volcanic glass)
igneous
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO2)
Mineral