Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Unnamed (gamma-Zn(OH)2) from
Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK


01750320017271929549788.jpg
Unnamed (gamma-Zn(OH)2), etc.

Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK
01750320017271929549788.jpg
Unnamed (gamma-Zn(OH)2), etc.

Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK
01750320017271929549788.jpg
Unnamed (gamma-Zn(OH)2), etc.

Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK
Locality type:Quarry
Classification
Species:'Unnamed (gamma-Zn(OH)2)' (not an IMA approved species)
Formula:γ-Zn(OH)2
Comments:Radial hemispherical masses to 1mm, associated with ashoverite, sweetite, and hemimorphite.
Habit:Radial lath-like
Colour:White
Quality for species:Excellent - world class for species or very significant. (!!)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Confirmation Details:Where Tested and Reference ID: NHM London
Associated Minerals:
Associates:Ashoverite
Fluorite
Associated Minerals Based on Photo Data:
Ashoverite2
Fluorite2
Sweetite1
Smithsonite1
Data
Mineral Data:Click here to view Unnamed (gamma-Zn(OH)2) data
Locality Data:Click here to view Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK
Data Identifiers
Mindat Occurrence Record ID:54568
Long-form Identifier:1:3:54568:2
GUID (UUID V4):0
References
58 (in German).
S Rust collection
Rust, Steve A. (1994) Seltene Mineralien aus dem Milltown-Steinbruch bei Ashover, Derbyshire, Großbritannien [Rare minerals from the Milltown Quarry near Ashover, Derbyshire, UK]. Lapis, 19 (12). 13-17; 58
 
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