Green Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Gold in Quartz Ore
Hydrothermal Quartz with native Gold (Au)
mineral
Chert with Iron Oxide Staining
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
sedimentary
Milky Quartz or Calcite Pebble
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Graphite
Graphite (Carbon, C)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Red Sandstone
Sandstone (lithic arenite or arkose with iron oxide)
sedimentary
Aura Rose Quartz
SiO2 (Silicon Dioxide with Titanium/Gold coating)
mineral
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Onyx (Mexican Onyx / Travertine)
Calcite (CaCO3) - Banded Travertine
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Mixed Crushed Stone
Aggregate (varied mineral composition)
igneous and sedimentary mixture
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Iron Hydroxide/Oxide (Limonite/Goethite)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Fibrous Quartz (SiO2) with iron inclusions
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary
Fossilized Shark Tooth
Scapanorhynchus (Sand Tiger Shark relative)
sedimentary
Pink Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Graphite
Graphite (Carbon, C)
mineral
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Altered Host Rock
mineral
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Milky Quartz with Chlorite/Epidote
Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral