Silicon (Industrial Grade)
Elemental Silicon (Si)
Category
Browse mineral like industrial smelting waste specimens identified by the Rock Identifier community.
Silicon (Industrial Grade)
Elemental Silicon (Si)
Schist (Micaceous)
Mica Schist
Chalcedony
Silicon Dioxide (SiO₂)
Greenschist
Greenschist (Chlorite-actinolite schist)
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Ruby (Raw Corundum)
Alumina (Al2O3) with Chromium traces
Obsidian (likely)
Volcanic glass, predominantly silica-rich rhyolitic composition (no fixed mineral formula)
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
Schist
Mica Schist
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
Blue Sapphire
Corundum (Al2O3 with Cr, Fe, and Ti trace elements)
Botryoidal chalcedony/geode fragment
Microcrystalline quartz (SiO₂), likely quartz-lined cavity with possible calcite
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
Marble
Recrystallized Calcite (CaCO3)
Banded Agate (Lace Agate)
Agate (Variety of Cryptocrystalline Quartz), SiO2
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Mica)
Granitic Pegmatite
Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
Yellow Quartz Pebble
SiO2 (Silicon Dioxide)
Blue-green mineral specimen, likely amazonite
Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Shale
Laminated Mudstone (Shale)
Rough Diamond
Diamond (pure Carbon, C)
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
Polished ocean jasper (orbicular chalcedony)
Silica-rich microcrystalline quartz, SiO₂; commonly sold as ocean jasper
Native Copper Nugget
Native Copper (Cu)
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Rough Diamond
Diamond (Native Carbon, C)
Green sea glass (likely bottle glass)
Man-made soda-lime silicate glass; not a natural mineral
Black-and-white bicolored pebble
Likely basalt with a pale felsic or carbonate coating/inclusion; exact identification requires testing
Yellow Calcite
Calcium Carbonate (CaCO3)
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
Copper Nugget
Native Copper (Cu)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Botryoidal prehnite
Prehnite, Ca₂Al(AlSi₃O₁₀)(OH)₂
Tumbled picture jasper
Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay inclusions
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F,O)4)
Cubic Zirconia (in Jewelry)
Zirconium Dioxide (ZrO2)