Scarbroite

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
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