General Information:
Chemical Formula:
(Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O)
IMA Status:
Approved IMA 1963
Locality:
Blue Mountain district, Marble, Garland County, Arkansas, USA.
Name Origin:
Named for E. W. Rector (1849-), legislator and lawyer of Hot Springs, Arkansas, USA.
Physical Properties:
Cleavage:
[???] Perfect
Color:
yellowish white or white.
Habits:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
Hardness:
1-2 - Between Talc and Gypsum
Luster:
Earthy (Dull)
Streak:
white
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