General Information:
Chemical Formula:
(Na,Ca)2Ta2O6(O,OH,F)
Composition:
(Molecular Weight = 529.02 gm)
Sodium 6.52 % Na
Calcium 3.79 % Ca
Tantalum 68.41 % Ta
Hydrogen 0.06 % H
Oxygen 20.87 % O
Fluorine 0.36 % F
Empirical Formula:
Na1.5Ca0.5Ta2O6.6(OH)0.3F0.1
Environment:
Granitic rocks.
IMA Status:
Approved IMA 1977
Locality:
Isalnd of Uto, State of Stockholm, Sweden.
Name Origin:
From the Greek mikros - "small" and lithos - "stone."
Physical Properties:
Cleavage:
[111] Indistinct, [111] Indistinct, [111] Indistinct
Color:
yellowish brown, reddish brown, greenish brown, green, or gray.
Density:
4.2 - 6.4, Average = 5.3
Diaphaniety:
Subtranslucent to opaque
Habits:
Disseminated - Occurs in small, distinct particles dispersed in matrix., Pseudo Octohedral - Crystals show an octohedral outline.,
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
None.
Luster:
Vitreous - Resinous
Streak:
light yellow
More details...