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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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Biotite trachyte

A rock subtype
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A variety of trachyte containing biotite


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Unique IdentifiersHide

Mindat ID:
54902
Long-form identifier:
mindat:1:1:54902:8

Classification of Biotite trachyteHide

Mineralogy of Biotite trachyteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Synonyms of Biotite trachyteHide

Internet Links for Biotite trachyteHide

References for Biotite trachyteHide

Reference List:

Localities for Biotite trachyteHide

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.
China
 
  • Inner Mongolia
    • Hinggan League (Xing'an Prefecture)
      • Horqin Right Front Banner (Ke'erqin Youyi Qianqi)
Wang et al. (2024)
Italy
 
  • Tuscany
    • Pisa Province
      • Lajatico
Borsi et al. (1967)
Madagascar
 
  • Diana
    • Ambanja District
      • Djangoa Commune
Lacroix (1922) +2 other references
Namibia
 
  • Khomas Region
    • Windhoek Rural
Gevers (1933) +3 other references
Saint Helena， Ascension and Tristan da Cunha
 
Campbell (1915)
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