Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Category
Metamorphic Or Igneous Alteration
Browse metamorphic or igneous alteration specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous Alteration in the encyclopedia
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Polished greenstone (likely serpentine or nephrite-like material)
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
metamorphic
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Iron-stained quartz-rich rock, likely granite or pegmatite fragment
Weathered granite/pegmatite; mainly quartz (SiO₂) with feldspar and iron-oxide staining
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jade
There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.
Mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Auriferous Quartz or Pyritic Ore
Iron Pyrite (FeS2) or Native Gold (Au) in Matrix
mineral
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Milky Quartz (Common Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Dumortierite Quartz
Dumortierite (Al7BCuO15)
metamorphic
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Epidote or Unakite Rock
Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Polished malachite
Malachite, Cu₂CO₃(OH)₂
mineral
Polished green stone, likely serpentine or altered basalt
Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing
metamorphic
Blue Quartz (or Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Unakite (Granite)
Altered Granite (Orthoclase, Epidote, Quartz)
metamorphic
Unakite
Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz
metamorphic
Unakite
Altered Granite (Plagioclase-Epidote-Quartz Rock)
metamorphic
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
White Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Nephrite Jade
Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Fuchsite
Chromian Muscovite, K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Unakite
Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Unakite
Epidotized Granite
metamorphic