Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Category
Mineral Like Byproduct
Browse mineral like byproduct specimens identified by the Rock Identifier community.
Learn about Mineral Like Byproduct in the encyclopedia
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Potash (Sylvite/Potassium Feldspar)
Potassium chloride (KCl) or Orthoclase (KAlSi3O8)
mineral
Schist
Mica Schist
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary
Mica Schist
Schist (primarily Muscovite and Biotite mica)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Gneiss
Gneiss
metamorphic
Geode (unopened nodule)
Silicon Dioxide (SiO2) Nodule
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Prehnite with Epidote
Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Pegmatite or Graphic Granite
Intrusive Igneous Rock
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Azurite-Malachite with Limonite
Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode formation
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
fossil
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2)
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz / Agate Nodule
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium impurities
mineral
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi₃O₈)
mineral
Silicon Carbide (Carborundum)
Moissanite (SiC), though mostly synthetic
mineral
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary