Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Category
Browse mineral_rock specimens identified by the Rock Identifier community.
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
Fluorite
Calcium Fluoride (CaF2)
Gneiss
Gneissic Metamorphic Rock
Granite
Phaneritic Felsic Igneous Rock
Granite
Granite (Felsic Plutonic Rock)
Azurite in Matrix
Azurite (Cu3(CO3)2(OH)2)
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferruginous Oxides
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
Granite
Phaneritic Felsic Igneous Rock
Granite
Granite (Felsic Plutonic Rock)
Diorite
Diorite (an intrusive igneous rock)
Pink Granite
Phaneritic Felsic Igneous Rock
Diorite
Intermediate plutonic igneous rock
Granite
Plutonic felsic igneous rock
Vesicular Basalt with Lichen
Vesicular Basalt
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Basalt
Extrusive mafic igneous rock
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Fluorite (Green)
Calcium Fluoride (CaF2)
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
Basalt with Calcite Veins
Aphanitic mafic volcanic rock with CaCO3 inclusions
Banded Quartz
Silicon Dioxide (SiO2)
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
Granite
Phaneritic Igneous Rock (Granitic)
Jasper (Multi-color Chert)
Silicon dioxide (SiO2)
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
Sandstone (with Concretion)
Arenite / Quartzose Sandstone