General Information
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 Chemical Formula: |
KLiMg2Si4O10F2 |
| Composition: |
Molecular Weight = 404.98 gm) |
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| Empirical Formula: |
KLiMg2Si4O10F2 |
| Environment: |
Nepheline-syenite pegmatites. |
| Locality: |
Narsarsuk, southern Greenland. |
| Name Origin: |
Named from the Greek for "band" or "strip", inallusion to hte tabular habit of the crystals. |
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Classification
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| Dana Class: |
71.2.2b.9 (71) |
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(71.2)Dana Type |
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(71.2.2b)Mica Group (Biotite subgroup) |
| Strunz Class: |
VIII/H.12-60 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups |
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VIII/H.12 - Mica group, Zinnwaldite series |
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Crystallography
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| Axial Ratios: |
a:b:c =0.577:1:1.1185 |
| Cell Dimensions: |
a = 5.231, b = 9.065, c = 10.14, Z = 2; beta = 99.86ø V = 473.73 Den(Calc)= 2.84 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.33(1) 9.95(0.9) 2.4(0.4) 4.98(0.4) 3.11(0.3) 4.48(0.3) 4.51(0.3) |
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Physical Properties
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| Cleavage: |
[001] Perfect |
| Color: |
brownish, colorless, or greenish brown. |
| Density: |
2.9 |
| Diaphaniety: |
Transparent |
| Habits: |
Micaceous - Platy texture with "flexible" plates., Foliated - Two dimensional platy forms., |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luminescence: |
Fluorescent. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.522-1.54, b=1.553-1.57, g=1.553-1.57, bire=0.0300-0.0310, 2V(Calc)=0, 2V(Meas)=2-5. Dispersion r > v or r < v. |
| Pleochroism (x): |
colorless. |
| Pleochroism (y): |
colorless. |
| Pleochroism (z): |
pale yellow. |
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Other Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana8) |
| See Also: |
Links to other data for Taeniolite :
1 -Alkali Nuts
2 -Athena Mineralogy
3 - EUROmin Project
4 -MinDat.org Location Data
5 -MinMax
6 -WWW-MINCRYST
7 -École des Mines de Paris
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