McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Home » Minerals » Prehnite

Prehnite


Mineral Properties and Uses



Physical Properties of Prehnite

Chemical Classification silicate
Color white, green, gray, yellow
Streak white
Luster vitreous
Diaphaneity transparent to translucent
Cleavage basal
Mohs Hardness 6 to 6.5
Specific Gravity 2.8 to 3.0
Diagnostic Properties color, cleavage
Chemical Composition Ca2Al(AlSi3O10)(OH)2
Crystal System orthorhombic
Uses ornamental material, semiprecious gem


Prehnite
A cabochon of prehnite from Brazil. This gem is 3 carats, and approximately 10 millimeters by 8 millimeters.



Find it on Geology.com




More from Geology.com


Sliding Rocks
Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa?
volcanic explosivity index
Volcanic Explosivity: Learn about some of the most explosive volcanic eruptions.
Canadian Diamonds
Canadian Diamond Mines produce some of the largest and highest quality gems!
Labradorite
Labradorite: A feldspar that produces bright flashes of iridescent colors.
Homeowners Insurance
Homeowners Insurance usually does not cover the most common geologic hazards.
Opal
Pictures of Opal: A collection of different types of opal from all around the world and Mars too!
Sand
Sand is a diverse material. This gallery includes photos of sand from around the world.
Ammolite
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.


Prehnite beads
Beads of prehnite. Each bead is approximately 6 millimeter across.




More Minerals
  Minerals
  Fluorescent Minerals
  Mineral Identification Chart
  Quartz
  Mohs Hardness Scale
  United States Gemstones
  Diamond
  Diamonds Do Not Form From Coal




© 2005-2014 Geology.com. All Rights Reserved.
Images, code and content of this website are property of Geology.com. Use without permission is prohibited. Pages on this site are protected by Copyscape.