Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Fulgurite
Lechatelierite (Silica glass tubes)
mineral
Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Quartz-rich feldspathic pebble, possibly granite or granitic gneiss
Quartz–feldspar aggregate, likely granite; dark inclusion may be biotite, hornblende, or iron-oxide staining
igneous
Blue calcite (probable)
Calcite, calcium carbonate (CaCO₃)
mineral
Raw calcite specimen
Calcite, calcium carbonate (CaCO₃)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz with Iron Oxide Staining (Citrine-like Quartz)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite / Fossilized Resin (C10H16O)
fossil
Sandstone (with Iron Staining)
Sandstone (mainly Quartz, SiO2, with Iron Oxides like Goethite/Hematite)
sedimentary
Tumbled Flint / Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Garnet Schist
Garnetiferous Mica Schist
metamorphic
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Turquoise, Pearl, and Coral Necklace
CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)
mineral
Diamond
Native Carbon (C)
gemstone
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Coarse-grained Granite
Granitoid (KAlSi3O8 + SiO2 + NaAlSi3O8)
igneous
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Polished citrine quartz point
Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst
mineral
Diamond
Carbon (C), Native Element
mineral
Amygdaloidal Basalt with Quartz Infill
Amygdaloidal Basalt (SiO2 infill)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with Fe-oxide cement)
sedimentary
Sandstone (likely Quartzose)
Arenite
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Dark fine-grained rock, likely basalt
Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Chert Breccia
Brecciated Chert (Sedimentary Rock)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tumbled banded jasper, likely brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
mineral
Tumbled jasper or chalcedony pebble
Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)
mineral
Quartz-rich rock, likely chert or chalcedony
Microcrystalline silica (SiO₂), possibly quartz/chalcedony
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartzite and Sandstone Pebbles
Silicon dioxide (SiO2)
metamorphic and sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (fossilized resin)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Tumbled white quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled white chalcedony (likely milky quartz)
Chalcedony, microcrystalline SiO₂; possibly milky quartz
mineral