Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Jasper with Agate Inclusions
Jasper (Silicon Dioxide, SiO2) with Chalcedony/Agate
sedimentary
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Granite
Granite (Silicic Plutonic Rock)
igneous
Chert (often referred to as Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Chert (often called Flint or Jasper locally)
Chert (Microcrystalline Quartz, Formula: SiO2)
sedimentary
Amber
Succinite (fossilized resin)
Organic Mineraloid
Copper Ore with Malachite and Chrysocolla
Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
metamorphic
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)
sedimentary
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
igneous
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Emerald In Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Dalmation Stone (frequently called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock
igneous
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Pink Granite
Granite (Phaneritic intrusive rock)
igneous
Amethyst
Crystalline Quartz (SiO2) with iron impurities
mineral
Gold Nugget
Native Gold (Au)
mineral
Red Coral
Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.
Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic intrusive igneous rock
igneous
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Kimberlite
Kimberlite
igneous
Peridot (Olivine)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)