Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Quartzite Pebbles (River Stones)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Banded Gneiss
Gneiss
Metamorphic
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
sedimentary
Kyanite (Blue or Blue-Grey)
Kyanite (Al2SiO5)
metamorphic mineral
Calcite with iron staining
Calcium Carbonate (CaCO3)
mineral
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Gold (Elemental Metal)
Gold (Au)
Mineral
Granite
Granite (compositionally: Quartz, Feldspar, Mica)
igneous
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Coquina
Coquina (a type of limestone)
Sedimentary
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Chalcedony (Agate/Quartz pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
mineral
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Yellow Quartz (Iron-stained Quartz)
Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Corundum
Corundum (Al2O3)
Mineral
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Quartzite with Quartz Veins
Quartzite (chiefly SiO2)
metamorphic
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Fluorite (Green Fluorite on Host Rock)
Fluorite (Calcium Fluoride, CaF2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary