Schist
Schist (various mineral compositions)
metamorphic
Category
Mineral (Pseudomorph)
Browse mineral (pseudomorph) specimens identified by the Rock Identifier community.
Learn about Mineral (Pseudomorph) in the encyclopedia
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Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz-rich pegmatitic rock, possibly rose quartz with mica
Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica
igneous
Biotite-bearing granite
Granite, composed mainly of quartz (SiO₂), potassium feldspar, plagioclase, and biotite mica
igneous
Polished black obsidian pyramid/block
Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)
igneous
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Greenstone (Epidote/Chlorite Rich Rock)
Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Quartz (Pink/Orange Variety)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Rough Quartz (Alluvial Pebbles)
Silicon Dioxide (SiO2)
mineral
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Quartz (Gravel fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Limonite / Brown Iron Ore
Hydrous Iron Oxide (FeO(OH)·nH2O)
mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Rose Quartz / Iron-stained Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary