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ATHENA

MINERALOGY

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Mineral: RECTORITE
Formula: (Na,Ca)Al4(Si,Al)8O20(OH)4.2H2O
Crystal System: Monoclinic
Group: Smectite group
IMA Number: 1967 s.p.
References: AM 67 (1982), 394; HB2/2 (1995)
Type Locality: Blue Mtn mining distr., Marble Top, Garland Co., Arkansas, USA
Comments: Regular Mica-Smectite interstratification
Rectorite, 10,5cm
"Mountain leather", "Bergleder", "Cuir de montagne"
La Table, Savoie, France
Photo and coll. P. Perroud (now in NHM Geneva).
See also: athena.unige.ch -> mineral pictures

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