Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Category
Mixed: Igneous And Sedimentary
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
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Yellow Agate
Silicon Dioxide (SiO2)
gemstone
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Granite Pebble with Quartz/Feldspar Vein
Intrusive Felsic Igneous Rock (Granite)
igneous
Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)
Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
metamorphic
Yellow-brown jasper or silicified volcanic rock
Microcrystalline quartz (chalcedony), SiO₂, likely jasper
mineral
River Pebbles (Mixed Lithology)
Conglomerate clasts (Silica-rich and Metamorphic assemblages)
sedimentary
Small white quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Yellow Chalcedony / Yellow Agate
Silicon Dioxide (SiO2)
mineral
Mixed rock fragments, likely granite and weathered metamorphic rock
Granite (quartz–feldspar–mica aggregate) with probable schist/gneiss fragments
igneous and metamorphic
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Agate
Chalcedony (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (chalcedony variety), SiO2
sedimentary
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Polished Tumbled Fluorite (or Dark Amethyst)
CaF2 (Calcium Fluoride) / SiO2 (Silicon Dioxide)
mineral
Tumbled quartz (likely milky or rose quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Likely pyrite-bearing rock or pyrite fragment
Pyrite (FeS₂), possibly mixed with quartz or carbonate matrix
mineral
Uncertain blue-white mineral fragment
Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent
mineral
Black Tourmaline (Schorl)
NaFe3Al6(BO3)3Si6O18(OH)4
Mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Dyed Agate
Chalcedony (SiO2)
gemstone
Carnelian (Carnelian Agate)
Carnelian (Silicon Dioxide - SiO2)
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Multi-gemstone Quartz and Fluorite Bracelet
Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)
mineral
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Porphyritic Igneous Rock / Porphyry
Porphyry (Plagioclase/Quartz phenocrysts in a finer-grained groundmass)
igneous
Dyed Agate
Silicon Dioxide (Chalcedony with artificial colorant), SiO2
gemstone
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Pyrite (FeS2)
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral