1 Physical Properties
1.1 Tenacity
Very brittle
Not Available
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, Brittle, Conchoidal
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, Brittle
1.6 Cleavage
{010} perfect, {110} distinct, {100} in traces
{110} Perfect, {???} Distinct, {???} Distinct
1.7 Mohs Hardness
1.8 Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)