Kaolinite (China Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Basalt (Glassy)
Basalt (Aphanitic-Glassy texture)
igneous
Porphyritic Basalt
Basalt (Extrusive Igneous Rock)
igneous
Orange Crackle Quartz
Silicon Dioxide (SiO2) with thermal fracturing
mineral
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic
![Schist (Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])) — metamorphic](https://media.rockidentification.com/82921e91-3bee-4a52-8b94-97f62233f834-thumbnail.jpg)
Schist
Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])
metamorphic
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
metamorphic
Sandstone Pebble
Quartz Sandstone
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplite rock composition)
igneous
Druzy Quartz on Ironstone
Silicon Dioxide (SiO2) on Limonitic Ironstone
mineral
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Breccia Pebble
Sedimentary Breccia
sedimentary
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Bumblebee Jasper
Fibrous Calcite and Orpiment/Realgar/Pyrite mix
gemstone
Sandstone / Chert Gravel
SiO2 (Silicon Dioxide based clastic sedimentary rock)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Schist
Mica Schist
metamorphic
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Porphyritic Basalt or Porphyritic Andesite
Porphyritic volcanic rock
igneous
Quartz-rich pegmatite with mica
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and muscovite/biotite mica
igneous
Schist
Mica Schist
metamorphic
Quartz with Celadonite Inclusion
Silicon Dioxide (SiO2) with green clay mineral inclusions
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
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
Pegmatitic Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Schist (Diamond Drill Core)
Mica Schist
metamorphic
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Quartz with Iron Staining
SiO2 with Fe oxide impurities
mineral
Mica-bearing quartz rock (likely pegmatite)
Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite
igneous
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
sedimentary
Rock Fragment with Calcite/Quartz Vein
Polymictic Rock Fragment (SiO2 / CaCO3)
igneous