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About MacusaniteHide

Named for the locality.
A name for Macusani glass, a natural glass of composition similar to some granite pegmatites.

Originally described from Macusani, Carabaya Province, Puno Department, Peru.

Named after the Macusani basin about 200 km north-northwest of Lake Titicaca. First noticed and studied as arrowheads etc. from archaeological digs in Peru and Bolivia. Eventually, the source of this material was found in the Macusani basin. Most typically found as pale yellow-green transparent alluvial pebbles with a surface texture a little like the better know green moldavites tektites from the Czech Republic. The glass usually has abundant well developed micro crystals floating in it, including the rare quartz-like mineral Virgilite for which this is the type locality.

Visit gemdat.org for gemological information about Macusanite.

Classification of MacusaniteHide

Crystallography of MacusaniteHide

Crystal System:

Synonyms of MacusaniteHide

Other Language Names for MacusaniteHide


References for MacusaniteHide

Reference List:
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Pichavant, M. et al. (1987) The Macusani glasses, SE Peru: evidence of chemical fractionation in peraluminous magmas. Geochemical Society Special Publication No.1 Magmatic Processes: Physiochemical Principles.
London, D., Hervig, R.L., and Morgan, G.B. VI (1988) Contributions to Mineralogy and Petrology, 99, 360-373.
London, D., Morgan, G.B. VI, and Hervig, R.L. (1989) Contributions to Mineralogy and Petrology, 102, 1-17.
Craig, N., Speakman, R.J., Popelka-Filcoff, R.S., Aldenderfer, M., Flores Blanco, L., Brown Vega, M., Glascock, M.D., and Stanish, C. (2010) Macusani obsidian from Southern Peru: A characterization of its elemental composition with a demonstration of its ancient use. Journal of Archeological Science, 37, 569-576.

Internet Links for MacusaniteHide

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Localities for MacusaniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Puno
    • Carabaya Province
[Clark, 1993 - "Hey's Mineral Index"]
London, D., Hervig, R.L., and Morgan, G.B. VI (1988) Contributions to Mineralogy and Petrology, 99, 360-373; London, D., Morgan, G.B. VI, and Hervig, R.L. (1989) Contributions to Mineralogy and Petrology, 102, 1-17.
Mineral and/or Locality  
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