Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Gneiss (Pebble)
Gneiss
metamorphic
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Amethyst on Agate/Basalt Matrix
Silicon Dioxide (SiO2) with iron impurities
mineral
Beryl (likely Aquamarine) in matrix
Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)
mineral
Larimar
Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))
Mineral
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gold Flake
Native Gold (Au)
mineral
Chert (varietal Flint)
Chert (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Basalt Porphyry
Porphyritic Basalt
igneous
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Chert (and Chert Geode)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Quartz Pebble (Water-worn Quartzite)
Silicon Dioxide (SiO2)
metamorphic