General Information
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 Chemical Formula: |
K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)] |
| Composition: |
Molecular Weight = 728.74 gm) |
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| Empirical Formula: |
K2Ca1.75Mn2+0.25Ti0.85Fe2+0.15Si7O19(OH) |
| Environment: |
K-feldspar metasomatites in contact with limestone. |
| IMA Status: |
Approved IMA 1965 |
| Locality: |
Murun alkalic massif, near Olekminsk, Yakutia, Russia. |
| Name Origin: |
Named fro the symbols of some of its component elements (Ti, Na, K). |
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Classification
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| Dana Class: |
67.2.1.1 (67)Inosilicate Unbranched Chains with W>2 |
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(67.2)with W=5 |
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(67.2.1)Dana Group |
| Strunz Class: |
VIII/F.22-30 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) Triplet chains [Si6O15/17]6-/10- and modified triplet bands |
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VIII/F.22 - Zorite - Tinaksite series |
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Crystallography
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| Axial Ratios: |
a:b:c =0.8504:1:0.5792 |
| Cell Dimensions: |
a = 10.35, b = 12.17, c = 7.05, Z = 2; alpha = 91ø, beta = 99.333ø, gamma = 92.5ø V = 875.29 Den(Calc)= 2.76 |
| Crystal System: |
Triclinic Space Group: P1,P1- |
| X Ray Diffraction: |
By Intensity(I/Io): 3.3(1) 3.25(0.8) 2.331(0.56) |
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Physical Properties
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| Cleavage: |
[010] Perfect, [110] Indistinct |
| Color: |
pink, pale yellow, or light brown. |
| Density: |
2.82 |
| Diaphaniety: |
Transparent to Translucent |
| Habits: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (+), a=1.593, b=1.621, g=1.666, bire=0.0730 |
| Pleochroism (x): |
colorless. |
| Pleochroism (y): |
colorless. |
| Pleochroism (z): |
pale orange yellow. |
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Other Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
| See Also: |
Links to other data for Tinaksite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -WWW-MINCRYST
6 -École des Mines de Paris
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