Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Black tourmaline (schorl)
Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Tumbled Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Polished turquoise (likely stabilized)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper silicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with quartz or turquoise
mineral
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Polished tree agate (likely)
Chalcedony (microcrystalline SiO₂) with green dendritic/inclusion minerals
mineral
Jasper Agate (Carnelian Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”)
Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix
metamorphic
Tumbled yellow quartz (likely citrine)
Quartz, silicon dioxide (SiO₂), iron-colored variety
mineral
Dyed Agate Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial pigment
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Conglomerate
Conglomerate
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
sedimentary
Quartz / Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Turquoise (likely stabilized or composite)
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Gold Nugget
Gold (Au)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Tiger Iron
Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)
metamorphic
Banded Calcite (Onyx Marble / Green Onyx)
Travertine / Banded Calcite (CaCO3)
sedimentary
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed predominantly of sand-sized grains, 0.0625 to 2 mm)
sedimentary