Greenstone / Diorite
Intermediate plutonic igneous rock
igneous
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Travertine
Travertine (CaCO3)
sedimentary
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (primarily Quartz Sandstone with Iron Oxide)
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
Igneous
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite with Calcite Accretion
Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)
metamorphic
Granite
Granite
igneous
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Mica Schist
Schist (Crystalline metamorphic rock)
metamorphic
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Mica Schist
Mica Schist
metamorphic
Iron Slag
Anthropogenic Ferro-silicate
mineral
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Schist
Mica Schist
metamorphic
Gneiss
Gneiss
metamorphic
Septarian Nodule
Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)
sedimentary
Gneiss (with iron staining)
Gneiss
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (SiO2 matrix with various silicate clasts)
sedimentary
Gneiss
Gneiss
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral