World Library  
Flag as Inappropriate
Email this Article

Okenite

Article Id: WHEBN0016722319
Reproduction Date:

Title: Okenite  
Author: World Heritage Encyclopedia
Language: English
Subject: List of minerals N–O (complete), List of minerals named after people
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Okenite

Okenite
240px
Okenite
General
Category Phyllosilicate
Formula
(repeating unit)
CaSi2O5·2H2O
Strunz classification 09.EA.40
Crystal symmetry Triclinic Space group: P1 or P1
Unit cell a = 9.69 Å, b = 7.28 Å, c = 22.02 Å; α = 92.7°, β = 100.1°, γ = 110.9°; Z=2
Identification
Color White, may show slightly yellow or blue tint
Crystal habit Bladed crystals, typically fibrous, clusters of curved crystals and radial balls
Crystal system Triclinic
Twinning Lamellar
Cleavage Perfect on {001}
Tenacity Elastic
Mohs scale hardness 4½-5
Luster Vitreous, pearly
Diaphaneity Transparent, translucent
Specific gravity 2.28 - 2.33
Optical properties Biaxial (-)
Refractive index nα = 1.512 - 1.532 nβ = 1.514 - 1.535 nγ = 1.515 - 1.542
Birefringence δ = 0.003 - 0.010
2V angle Measured: 60°
References [1][2][3]

Okenite (CaSi2O5·2H2O)[2] is a silicate mineral that is usually associated with zeolites. It most commonly is found as small white "cotton ball" formations within basalt geodes. These formations are clusters of straight, radiating, fibrous crystals that are both bendable and fragile.[4]

Discovery and occurrence

It was first described in 1828 for an occurrence at Disko Island, Greenland and named for German naturalist Lorenz Oken (1779–1851).[3]

Minerals associated with okenite include apophyllite, gyrolite, prehnite, chalcedony, goosecreekite and many of the other zeolites. Okenite is found in India, mainly within the state of Maharashtra. Other localities include Bulla Island, Azerbaijan; Aranga, New Zealand; Chile; Ireland and Bordo Island in the Faroe Islands.[2]

References

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.