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  

Finnemanite

#PD38567

Finnemanite

#PD38567
Availability
Sold
Size
6 x 5.5 x 3 cm - Sm Cabinet 
Formula
Pb5(As3+O3)3Cl (RRUFF)
Locality
Långban, Filipstad, Värmland, Sweden
Tagged
arsenate

Here's a Langban treasure highly sought after and exceedingly rare. It has been verified by XRD. Both sides contain flat lying dark grey, elongated, crystals, mal-formed probably from tight conditions which would restrict the growth. The longest crystal is 1cm with numerous smaller crystals. It is much like the photo in the photo on page 118 of the Langban book by Bollmark et al. Granted they are not exposed as much however the matrix is the same, a granular hematite, as well as  the reddish orange or yellowish crust in which the crystals grew. The backside has numerous crystals also just as obvious under a scope. There is a small 1mm to less veinlet along the side of the specimen, which also has one small crystal.The adamantine luster is much like that of cerussite. The prismatic nature is unlike cerussite however. It's a definte match as shown on the XRD pattern.

It has an old inked number on the backside, unfortunately I do not have the old label to go with the number. But there is one label typed on the backside of an old business card from "Camden Mineral Company" of a one E. W. Rushton from Camden, Maine.

Type Locality, XRD Confirmed

Finnemanite

Formula
Pb5(As3+O3)3Cl 
Crystal System
Hexagonal 
Cleavage
Distinct, None, None 
Luster
Subadamantine 
Color
gray, black 
Class
Hexagonal - Pyramidal 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Type Locality
Special Info
XRD Confirmed

Other Sold

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2024 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map