Cavansite on stilbite
Alfie Norville Gem and Mineral Museum
Tucson, Arizona
Sunday Challenge: Find the intruder
Present a photo of any subject including something that should not be there and ask viewers to find it. It can be something obvious or obscure. A black chair in a sea of red chairs, a mis-colored brick in a wall, a hammer amongst the kitchen utensils, etc.
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Taken on Saturday February 14, 2026
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Posted on Monday June 1, 2026
- 47 visits
- 13 people like
13 comments
Gillian Everett said:
Xata said:
Kayleigh said:
Annemarie said:
Happy new week:)
Jaap van 't Veen said:
PhLB - Luc Boonen said:
Esther replied to PhLB - Luc Boonen:
"Cavansite, named for its chemical composition of calcium vanadium silicate, is a deep blue hydrous calcium vanadium phyllosilicate mineral, occurring as a secondary mineral in basaltic and andesitic rocks along with a variety of zeolite minerals. Its blue coloring comes from vanadium, a metal ion.[6] Discovered in 1967 in Malheur County, Oregon, cavansite is a relatively rare mineral. It is polymorphic with the even rarer mineral, pentagonite. It is most frequently found in Pune, India, and in the Deccan Traps, a large igneous province."
en.wikipedia.org/wiki/Cavansite
But it sure sounds as if you know your minerals, as minerals containing copper are often blue or green.
Gudrun said:
I have never before seen cavansite and had to read it up:-) You could say it's an intruder but so is the stilbite- both developing hydrothermally in cavities in basalt or tuff. In your photo one can also see the (I presume) basalt.
Günter Klaus said:
Wünsche noch einen schönen Tag,liebe Grüße Güni :))
Don Sutherland said:
William Sutherland said:
Admired in: www.ipernity.com/group/tolerance
Patrick Brandy said:
Esther said: