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


gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Geologist Tools
Geologist Tools: Visit our store for a large selection of field and laboratory tools.
Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Sea Level Rise Map
Sea Level Rise Map: A Google map that shows where flooding will occur as sea level rises.
Gems from Space
Gems from Space A number of materials from space have been used as attractive gems.
Zircon
Zircon is a popular and colorful gem with fire and brightness that rival diamond.
Mount Cleveland
Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
limonite
Limonite - an amorphous iron oxide. Used as an iron ore and pigment since prehistory.


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




More Minerals
  Minerals
  Diamond
  Topaz
  Fluorescent Minerals
  Rock, Mineral and Fossil Collections.
  Quartz
  Calcite
  Geology Tools






© 2005-2017 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.