Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous
Amethyst
Amethyst (Silicon Dioxide with iron impurities), SiO2
mineral
Agate Geode
Silicon dioxide (SiO2) - Chalcedony
mineral
Jasper (Zebra Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone with Quartz Veining
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Garnet in Matrix
Almandine/Grossular Garnet in Pegmatite or Schist
mineral
Rose Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
sedimentary
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Labradorite (Polished Tumbled Stone)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Gneiss
Gneiss
metamorphic
Labradorite
Labradorite (a calcium-enriched sodic plagioclase feldspar mineral - (Ca, Na)(Al, Si)4O8)
mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
mineral
Rounded greenish river pebble, likely basalt or altered volcanic rock
Probable basalt (fine-grained mafic silicate rock), possibly epidote/chlorite-altered
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Rose Quartz
Rose Quartz (SiO2 - Silicon Dioxide with trace amounts of titanium, iron, or manganese)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Labradorite (Polished Sphere)
(Ca, Na)(Al, Si)4O8 (Silicate mineral)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss
metamorphic
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
metamorphic
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Mica Schist with Iron Staining
Muscovite/Biotite Schist
metamorphic
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral