mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Chiavennite with Helvine, Natrolite & Analcime

#PD40474

Chiavennite with Helvine, Natrolite & Analcime

#PD40474
Availability
Sold
Size
5.5 x 5 x 4 cm - Sm Cabinet 
Formula
CaMn2+(BeOH)2Si5O13·2H2O (RRUFF)
Locality
Tvedalen, Larvik, Vestfold, Norway
Tagged
beryllium , pegmatite mineral

A rich specimen of orange, rosette-like crystals of Chiavennite to around .75mm. It is an orthorhombic beryllium zeolite. Outside of the Larvik area, it is only found in 3 or 4 other localities worldwide, all pegmaites.

The Langesundsfjord area hosts some of the world's most mineralogically diverse nepheline syenite pegmatites. The host rock is the silica poor Larvikite, a monzonitic rock, which is used as a local building stone.

This specimen also contains numerous amber colored Helvine (red arrows) crystals to 1mm. I don't think these are Wickmanite or Tetrawickmanite. Zircons are also present as well as tiny colorless Analcime crystals and prismatic Natrolite. It is an excellent specimen.

Chiavennite

Formula
CaMn2+(BeOH)2Si5O13·2H2
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, orange, red orange 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection

Other Sold

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map