Basalt with Weathering Rind
Basalt (Mafic volcanic rock)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Granite (Weathered/Oxidized)
Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)
igneous
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Fossilized Shark Tooth
Elasmobranchii (fossilized matrix/root section)
fossil
Dalmatian Jasper
Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)
igneous
Ruby in Zoisite (Anyolite)
Anyolite (Combination of Corundum and Zoisite)
metamorphic
Mica Schist with Quartz and Muscovite
Muscovite-Quartz Schist
metamorphic
Basalt
Basalt
igneous
Citrine
Silicon Dioxide with iron impurities (SiO2)
mineral
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Granite (Weathered)
Granite (Felsic Plutonic Rock)
igneous
Slate with Iron Staining
Low-grade Metamorphic Mudstone (Slate)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
metamorphic
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Mica (Muscovite)
Muscovite, KAl2(AlSi3O10)(OH)2
Mineral
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2 + Fe2O3)
igneous
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Porphyritic Basalt (Amygdaloidal)
Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)
igneous
Graywacke Pebble with Quartz Vein
Argillaceous Sandstone (Graywacke)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
Igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz (specifically Milky Quartz or Quartzite)
Silicon Dioxide (SiO2)
mineral
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Mica Schist with Iron Staining
Mica Schist
metamorphic
Green Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Garnet Schist
Almandine Garnet in Mica Schist
metamorphic
Granite Boulder
Intrusive Igneous Rock
igneous
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
metamorphic
Granite
Felsic intrusive igneous rock
igneous