General Information:
Chemical Formula:
Al5(CO3)(OH)13·5(H2O)
Composition:
(Molecular Weight = 506.09 gm)
Aluminum 26.66 % Al
Hydrogen 4.58 % H
Carbon 2.37 % C
Oxygen 66.39 % O
Empirical Formula:
Al5(CO3)(OH)13·5(H2O)
Environment:
In vertical fissures in sandstone.
Locality:
South Bay, Scarborough, England.
Name Origin:
Named after the locality.
Physical Properties:
Color:
white.
Density:
1.85 - 2.05, Average = 1.95
Habits:
Pseudo Rhombohedral - Crystals show a rhombohedral outline., Platy - Sheet forms (e.g. micas)., Microscopic Crystals - Crystals visible only with microscopes.
Hardness:
1-2 - Between Talc and Gypsum
Streak:
white
More details...