General Information:
Chemical Formula:
MgAl2O4
Composition:
(Molecular Weight = 142.27 gm)
Magnesium 17.08 % Mg
Aluminum 37.93 % Al
Oxygen 44.98 % O
Empirical Formula:
MgAl2O4
Name Origin:
Of uncertain origin, possibly derived from Latin, spina, for "thorn" in allusion to sharply-pointed crystals.
Physical Properties:
Cleavage:
None
Color:
colorless, red, blue, green, or brown.
Density:
3.57 - 3.72, Average = 3.64
Diaphaniety:
Transparent to translucent to opaque
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock.,
Hardness:
8 - Topaz
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
grayish white
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