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

Home » Minerals » Orthoclase


Mineral Properties and Uses

Physical Properties of Orthoclase

Chemical Classification silicate
Color white, gray, flesh pink, reddish, yellow, green
Streak white
Luster vitreous
Diaphaneity translucent to subtranslucent
Cleavage perfect
Mohs Hardness 6 to 6.5
Specific Gravity 2.5 to 2.6
Diagnostic Properties cleavage, color
Chemical Composition KAlSi3O8
Crystal System monoclinic
Uses gemstones, ceramics

Find it on

More from

gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Asteroid Impact Map
Asteroid Impact Map: Explore fifty of the most obvious asteroid impact craters on Earth.
Sliding Rocks
Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa?
Utica Shale
Utica Shale is confirmed as a major source of oil, natural gas and natural gas liquids.
Is Water a Mineral?
Are Water and Ice Minerals? Comparing their properties with the definition of a mineral.
Life on Europa
Life on Europa could exist in a salty ocean deep below its frozen surface.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.

More Minerals
  Mineral Identification Chart
  Fluorescent Minerals
  Mohs Hardness Scale
  Find Minerals and Gems

© 2005-2015 All Rights Reserved.
Images, code and content of this website are property of Use without permission is prohibited. Pages on this site are protected by Copyscape.