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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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Larsenite from
Franklin Mine, Franklin, Sussex County, New Jersey, USA


Locality type:Mine
Classification
Species:Larsenite
Formula:PbZnSiO4
Comments:Acicular to long-prismatic, colourless crystals in fracture surface cavities traversing willemite-franklinite ore with esperite present.

The type locality for larsenite is the Franklin MIne, not the Parker Shaft. Palache (1935) makes it clear: "Larsenite was first found in 1928 and, with the closely related, was described in papers by Palache, Bauer, and Berman (256, 259). The first specimens were found on the picking table at Franklin, and the mineral was afterwards located in the mine at the north end, 20 feet above the 400-foot level in top slice 1080."
Habit:Acicular to long-prismatic
Colour:Colourless, white
Luminescent properties:None.
Quality for species:Excellent - world class for species or very significant. (!!)
Abundance at site:Very Rare
Confirmation
Validity:Valid - Type Locality
Associated Minerals:
Associates:Esperite
Franklinite
Willemite
Associated Minerals Based on Photo Data:
Willemite6
Clinohedrite5
Hodgkinsonite2
Franklinite1
Zincite1
Data
Mineral Data:Click here to view Larsenite data
Locality Data:Click here to view Franklin Mine, Franklin, Sussex County, New Jersey, USA
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:49977
Long-form Identifier:1:3:49977:2
GUID (UUID V4):0
Localities for Larsenite in this Region
Parker shaft, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Nearest other occurrences of Larsenite
0.6km (0.4 miles) Parker shaft, Franklin Mine, Franklin, Sussex County, New Jersey, USA
References
 
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