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


Identifying Meteorites
Identifying Meteorites - Step one in identifying a possible meteorite is the magnet test.
uses of gold
The Many Uses of Gold: Unique properties make gold one of the most useful metals.
Garnet
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Geo Rock Bags
Rock Bags - Durable field bags with pockets for carrying maps, books, specimens and tools.
World Oil Shales
Oil Shales in Australia, Brazil, Canada, China, Israel, Russia, Syria, United States and others.
city satellite images
What City is This? Can you recognize United States cities from satellite images?
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Tsunami Causes
What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.


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




More Minerals
  Minerals
  Fluorescent Minerals
  Mineral Identification Chart
  Mohs Hardness Scale
  Hardness Picks
  Hand Lens
  Diamond
  Quartz




© 2005-2016 Geology.com. All Rights Reserved.
Images, code, and content on this website are property of Geology.com and are protected by copyright law.
Geology.com does not grant permission for any use, republication, or redistribution.
Images, code and content owned by others are marked on the pages where they appear.