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| Tinaksite
is named for its composition: titanium (Ti), sodium (Na), potassium (K) and silicon (Si)
- Ti-Na-K-Si-te. The picture at left shows orange Tinaksite
associated with purple Charoite,
yellow Canasite and
black Aegirine.
| Discovered
in 1965;
IMA
status: Valid (IMA approved) |
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Chemistry
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Chemical
Formula: |
K2Na(Ca,Mn2+)2(Ti,Fe)Si7O19(OH)
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Potasium Sodium Calcium
Manganese Titanium Iron Oxide Silicate Hydroxide |
Molecular
Weight: |
751.73 gm |
Composition: |
Potassium |
10.40 % |
K |
12.53 % |
K2O |
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Sodium |
3.06 % |
Na |
4.12 % |
Na2O |
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Calcium |
9.33 % |
Ca |
13.05 % |
CaO |
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Titanium |
5.41 % |
Ti |
9.03 % |
TiO2 |
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Manganese |
1.83 % |
Mn |
2.36 % |
MnO |
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Iron |
1.11 % |
Fe |
1.43 % |
FeO |
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Silicon |
26.15 % |
Si |
55.95 % |
SiO2 |
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Hydrogen |
0.13 % |
H |
1.20 % |
H2O |
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Oxygen |
42.57 % |
O |
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100.00 % |
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99.68 % |
= TOTAL OXIDE |
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Classification
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Mineral
Classification: |
Silicates
(Germanates)
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Strunz 8th
Ed. ID:
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8/F.22-30
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Nickel-Strunz 10th
Ed. ID:
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9.DG.75
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9 : SILICATES (Germanates) D : Inosilicates G : Inosilicates with 3-periodic single and multiple chains
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Related
to: |
Tinaksite
Group.
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Crystal
Data
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Crystallography:
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Triclinic
- Unknown or Uncertain Class
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Crystal
Habit:
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As
well-formed long prismatic crystals, to 15 cm; commonly
as bundles and rosettes of radiating crystals, or compact
fibrous aggregates, to 10 cm.
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Twinning:
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None
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Physical
Properties
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Cleavage: |
{010} Perfect, {110} Indistinct
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Fracture: |
Fibrous
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Tenacity:
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Brittle
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Moh's
Hardness: |
6.0
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Density:
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2.82
- 2.90 (g/cm3)
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Luminescence:
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None |
Radioactivity:
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Barely
Detectable;
GRapi = 148.49 (Gamma Ray American Petroleum Institute Units)
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Optical
Properties
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Color: |
Pink, Pale Yellow, Light Brown,
Orange
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Transparency: |
Transparent
to Translucent
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Luster: |
Vitreous
on cleavages
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Refractive
Index: |
1.593
- 1.666 Biaxial ( + )
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Birefringence: |
0.0730
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Dispersion: |
Strong
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Pleochroism: |
X
= Y = colorless; Z = pale orange-yellow
or orange-brown
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Occurances
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Geological
Setting: |
An
accessory mineral in potassic feldspar metasomatites
at the contact with limestones (Murun massif, Russia).
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Common
Associations: |
Potassic
Feldspar, Aegirine, Quartz, Canasite, Xonotlite (Murun
massif, Russia); Orthoclase, Pyroxene, Aegirine, Astrophyllite,
Hisingerite (Khibiny massif, Russia). |
Common
Impurities: |
Al,
Fe, Mg, H2O |
Type
Locality: |
Murunskii Massif, Chara
and Tokko Rivers Confluence, Aldan Shield, Saha Republic (Sakha
Republic; Yakutia), Eastern-Siberian Region, Russia |
Year
Discovered: |
1965 |
View
mineral photos: |
Tinaksite
Mineral Photos and Locations |
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More
Information
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Mindat.org Webmineral.com
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Tinaksite
is a fairly common but relatively unknown mineral that
is most commonly found as light brown to orange fibrous
aggregates in Charoite. It is often chatoyant and contrasted
against swirling purple Charoite makes for beautiful
cabochons. The picture above shows orange Tinaksite
associated with purple Charoite,
yellow Canasite and
black Aegirine.
Tinaksite is extremely rare as a faceted gem.
Tinaksite
is found at only two localities in the world, and both
are in Russia; in the Murun massif, southwest of Olekminsk,
Yakutia, and on Mt. Rasvumchorr, Khibiny massif, Kola
Peninsula.
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Tinaksite
gems for sale:
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have not photographed our Tinaksite gems. Please
check back soon.
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