Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
![Lepidolite and Rubellite (Pink Tourmaline) (Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2] and Rubellite [Na(Li,Al)3Al6(BO3)3Si6O18(OH)4]) — igneous](https://media.rockidentification.com/b648846b-7d52-4820-886f-adda463c0f3c-thumbnail.jpg)
Lepidolite and Rubellite (Pink Tourmaline)
Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2] and Rubellite [Na(Li,Al)3Al6(BO3)3Si6O18(OH)4]
igneous
Bloodstone
Chalcedony (cryptocrystalline quartz)
Mineral/Semiprecious Stone
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Quartz Vein in Siltstone
Siltstone with Quartz (SiO2) inclusion
sedimentary
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Schist
Mica Schist
metamorphic
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous
Granite
Granite
igneous
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Titanium Aura Quartz
Silicon Dioxide (SiO2) coated with Titanium and Niobium
mineral
Basalt with vesicles/amygdules
Basalt (containing volcanic glass and plagioclase)
igneous
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Beryl (Aquamarine)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Vesicular Basalt with Secondary Mineral Infill
Mafic Volcanic Rock (Basalt)
igneous
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Emerald in Matrix
Emerald (variety of Beryl) - Be3Al2(SiO3)6
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Schist
Mica Schist
metamorphic
White Topaz
Topaz - Al2SiO4(F,OH)2
mineral
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral