Sandstone (with Manganese staining)
Arenite (composed primarily of SiO2)
sedimentary
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Basalt with Epidote (Porphyry)
Basalt (with inclusions of Epidote/Feldspar)
igneous
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
River Stone (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) based metamorphosed sandstone
metamorphic or sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sapphire (Corundum)
Corundum (Al2O3), variety Sapphire
Mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Chert (specifically Jasper/Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Mica Schist
Mica Schist (Intermediate-grade Metamorphic Rock)
metamorphic
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Ruby in Matrix
Corundum (Al2O3)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Smoky Quartz
Quartz (Silicon Dioxide), Formula: SiO2
mineral
Jade
There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.
Mineral
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Diorite (Gneissic)
Diorite
igneous
Pink Granite (Gneissic transition)
Pink Biotite Granite
igneous
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Sandstone
Arenite (SiO2 based)
sedimentary
Granite (Weathered/Oxidized)
Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)
igneous
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
metamorphic