Graphite
Graphite (Carbon, C)
mineral
Category
Mixed
Browse mixed specimens identified by the Rock Identifier community.
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Graphite
Graphite (Native Carbon, C)
metamorphic
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Conglomeratic breccia
Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix
sedimentary
Polished brown jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety
mineral
Jasper and Quartz Breccia
Silica breccia (SiO2)
sedimentary
Mixed river gravel (alluvial conglomeratic sediment)
Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments
sedimentary
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Mixed Mineral Specimens
Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)
mineral
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Diorite
Diorite (plutonic igneous rock)
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Granite (Pink/Potassium Feldspar rich)
Granite (K-feldspar rich intrusive igneous rock)
igneous
Agate (Lake Superior Agate variant)
Chalcedony / Silicon Dioxide (SiO2)
sedimentary
Asphalt Conglomerate
Artificial Bituminous Conglomerate
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Jasper with Quartz
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Granodiorite
Intermediate Phaneritic Plutonic Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Graphite
Graphite (Native Carbon, C)
metamorphic
Chalcedony Agate / Carnelian nodules in Matrix
SiO2 (Silicon Dioxide) with iron oxide inclusions
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral
Green Spot Jasper (Kiwi Jasper / Sesame Jasper)
Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions
metamorphic
Granite / Feldspar gravel
Granite (felsic intrusive igneous rock)
igneous
Chrysocolla in Cuprite / Mixed Copper Ore
Hydrated copper silicate and copper(I) oxide, (Cu,Al)2H2Si2O5(OH)4·nH2O and Cu2O
mineral
Mahogany Obsidian
Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Chrysocolla with Malachite
Cu2-xAlx(H2-xSi2O5)(OH)4%CnH2O (Chrysocolla)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chrysocolla (carved)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous