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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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Fourchite

A rock subtype
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A melanocratic analcime lamprophyre containing abundant augite but devoid of olivine and feldspar.


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Unique IdentifiersHide

Mindat ID:
55166
Long-form identifier:
mindat:1:1:55166:1

Classification of FourchiteHide

Mineralogy of FourchiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
AnalcimeNa(AlSi2O6) · H2O
Pyroxene > Clinopyroxene > Augite(CaxMgyFez)(Mgy1Fez1)Si2O6

Internet Links for FourchiteHide

References for FourchiteHide

Reference List:

Localities for FourchiteHide

Showing 3 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Angola
 
  • Namibe Province
    • Camacuio
Lapido-Loureiro +2 other references
Brazil
 
  • Pernambuco
    • Fernando de Noronha archipelago
Woolley (2019)
USA
 
  • Arkansas
    • Hot Spring County
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