Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
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Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky and Smoky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Banded Gneiss
Metamorphic Gneiss
metamorphic
Citrine or Yellow Sapphire
Quartz (SiO2) or Corundum (Al2O3)
gemstone
Uncertain small stone; possibly weathered quartz-bearing rock
Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock
mineral
Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Potassium Feldspar (Microcline / Orthoclase)
KAlSi3O8
mineral
Moonstone
Orthoclase (KAlSi3O8) or Oligoclase with adularescence
gemstone
Garnet
Silicate mineral group (often Pyrope or Almandine in this color range)
gemstone
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Hematite
Iron Oxide (Fe2O3)
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Kfeldspar (Potassium Feldspar)
KAlSi3O8
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Rainbow Moonstone (White Labradorite)
Labradorite (White varieties with Schiller effect), (Na,Ca)(Al,Si)4O8
gemstone
Magnetite (Charnockite Regional Variation)
Magnetite (Fe3O4)
mineral
Likely mica-rich metamorphic rock (schist)
Mica schist, probably biotite–muscovite schist; exact identification requires closer examination
metamorphic
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Garnet in Schist or Pegmatite
Almandine Garnet (Fe3Al2(SiO4)3) in host rock
metamorphic
Zoisite with Rubellite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende (Anyolite)
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist
Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix
metamorphic
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral