Diamond
Carbon (C)
mineral
Category
Mineral Health
Browse mineral health specimens identified by the Rock Identifier community.
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Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Gold Quartz (Auriferous Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Bismuth
Native Bismuth (Bi)
mineral
Diamond
Carbon (C) - Native Element
mineral
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Diamond
Diamond (C)
mineral
Banded Gneiss
Gneiss
metamorphic
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Petoskey Stone
Hexagonaria percarinata
Sedimentary
Barite
Barium Sulfate (BaSO4)
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Raw Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Gneiss
Gneiss
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral inclusions
sedimentary
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Greenschist (Greenstone River Pebble)
Greenschist (Chlorite Schist)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Quartzite (Aventurine type)
Metamorphosed Quartz Sandstone (SiO2 with inclusions)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary