Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Tree Agate
Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides
mineral
Rose Quartz
SiO2 (Silicon Dioxide with trace amounts of iron, manganese, or titanium)
mineral
Quartz (White or Milky Quartz Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Cloudy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Agate (translucent slice)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Gold Ore
Native Gold (Au)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Druzy Agate (Star-cut Geode Slice)
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz
mineral
River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Gray/Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Botswana Agate
Silicon Dioxide (SiO₂), a cryptocrystalline variety of Quartz and Chalcedony
sedimentary
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Quartz (Variety: Rose Quartz/Smoky Quartz mix)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Prehnite
Prehnite Ca2Al2Si3O10(OH)2
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Garden Quartz
Silicon Dioxide (SiO2) with various inclusions (Lodolite)
mineral
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary