Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Material Processed By Nature) in the encyclopedia
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Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Epidote with Unakite characteristics
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
metamorphic
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Assorted Semi-Precious Gemstone Crosses
Quartz, Silicates, Carbonates (various)
mineral
Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Amber
Succinite (C10H16O)
mineral
Quartzite pebble
Quartzite (SiO2)
metamorphic
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite with Glauconitic or Iron staining
Quartzite (SiO2 with accessory minerals)
metamorphic
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble with Hematite Inclusion
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Orange Calcite
Calcite (CaCO3)
mineral
Chert (often called Jasper or River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Sodalite
Na4Al3(SiO4)3Cl (Sodium Aluminum Silicate Chloride)
mineral
Green Serpentine
Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
mineral
Chert Nodule / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Fossil Shark Tooth
Selachii fossil
fossil
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Red Sandstone
Ferruginous Sandstone (formula varies, primarily SiO2 with Fe2O3)
sedimentary