Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Category
Synthetic Glass (Often Categorized As A Simulated Mineral)
Browse synthetic glass (often categorized as a simulated mineral) specimens identified by the Rock Identifier community.
Chert / Greenstone
Silicon Dioxide (SiO2) with impurities
sedimentary
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Quartzite Pebble (with Quartz veins)
Quartzite (SiO2)
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Diorite
Phaneritic intermediate plutonic rock
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Quartzite (Sugar Quartz)
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Grey Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Quartz Crystal
Quartz (SiO₂)
Mineral
Jasper in Rhyolite matrix
Silicon Dioxide (SiO2) with various inclusions in Felsic Igneous matrix
igneous
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper Agate (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral