Mineral or Sedimentary (if chert)
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Hardness: 7 on Mohs scale, Color: Light green, greyish-green, or yellowish-green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (cryptocrystalline if chert), Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
Identified More mineral or sedimentary (if chert) →
Explore Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone. in the encyclopedia →Identify your own rocks.
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Physical properties
Hardness: 7 on Mohs scale, Color: Light green, greyish-green, or yellowish-green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (cryptocrystalline if chert), Cleavage: None (conchoidal fracture), Specific gravity: ~2.65
Formation & geological history
Forms in a variety of geological environments including igneous, metamorphic, and sedimentary processes. Water-worn appearance suggests it was found in a riverbed, beach, or stream.
Uses & applications
Commonly collected as a curiosity, used in lapidary arts, or sometimes industrial uses if massive.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Green varieties can sometimes be called prasiolite (rare) or form due to inclusions like chlorite.
Field identification & locations
Identify by its hardness (will scratch glass) and conchoidal fracture. Often found worldwide in many ordinary geological settings.
More like this
Other mineral or sedimentary (if chert) specimens
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert Nodule in Limestone
Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Pink and Yellow Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chert
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper variety)
Chert (SiO2)
sedimentary