Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:RECTORITE
Formula:(Na,Ca)Al4(Si,Al)8O20(OH)4 · 2H2O
Crystal System:Monoclinic
Strunz Nr:8/H.18-30
Group:Smectite Group
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
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