Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Category
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Browse this is not a rock or mineral specimens identified by the Rock Identifier community.
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O
mineral
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Basalt
Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive)
igneous
Ferruginous Sandstone
Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Porphyritic Basalt (River Rock)
Porphyritic Basalt
igneous
Red Jasper
Red Jasper (SiO2 with Fe2O3 impurities)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Septarian Nodule Segment (Turtle Stone)
Septarian Concretion (CaCO3 with Siderite or Calcite infill)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Mica Schist
Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)
metamorphic
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Mahogany Obsidian
Volcanic Glass (with inclusions of Magnetite or Hematite)
igneous
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Obsidian
Obsidian (principally SiO2)
igneous
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral