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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Fassinaite from
Susanna Mine (Glennery Scar vein; Susanna vein [Scar vein]; Portobello vein; Humby vein; Lead vein), Leadhills, South Lanarkshire, Scotland, UK


09333550017272736147564.jpg
Fassinaite

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
05766140017272008388342.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
07002990017370995343023.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
08940390017370995346953.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
01838560017370995358271.jpg
Fassinaite

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
05900470017370995352802.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
09138540017366072519560.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
05380330017366076259902.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
09333550017272736147564.jpg
Fassinaite

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
05766140017272008388342.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
01332050017370995366832.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
03080210017370995363594.jpg
Fassinaite, etc.

Susanna Mine, Leadhills, South Lanarkshire, Scotland, UK
Locality type:Mine
Classification
Species:Fassinaite
Formula:Pb2(S2O3)(CO3)
Comments:Colourless; looks a little like sword-shaped anglesite with distorted terminations.
Abundance at site:Very Rare
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Susannite4
Cerussite4
Leadhillite4
Scotlandite4
Anglesite4
Data
Mineral Data:Click here to view Fassinaite data
Locality Data:Click here to view Susanna Mine (Glennery Scar vein; Susanna vein [Scar vein]; Portobello vein; Humby vein; Lead vein), Leadhills, South Lanarkshire, Scotland, UK
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:796929
Long-form Identifier:1:3:796929:4
GUID (UUID V4):0
References
Steve Rust collection (SXRD-analysed by Uwe Kolitsch)
 
and/or  
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