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| Fluornatromicrolite
is named for its relationship with Microlite and
its Fluorine and Sodium (Natrium in Latin) content.
| Discovered
in 1998;
IMA
status:
Valid (IMA approved
1998) |
|
Chemistry
|
|
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Chemical
Formula: |
(Na,Ca,Bi)2Ta2O6F
|
|
Sodium
Calcium Bismuth Tantalum Fluorine Oxide |
Molecular
Weight: |
570.32 gm
|
Composition: |
Sodium |
4.84 % |
Na |
6.52 % |
Na2O |
|
Calcium |
4.22 % |
Ca |
5.90 % |
CaO |
|
Tantalum |
63.45 % |
Ta |
77.48 % |
Ta2O5 |
|
Bismuth |
7.33 % |
Bi |
8.17 % |
Bi2O3 |
|
Oxygen |
16.83 % |
O |
|
|
|
Fluorine |
3.33 % |
F |
3.33 % |
F |
|
— |
— % |
F |
-1.40 % |
-O=F2 |
|
|
100.00 % |
|
100.00 % |
= TOTAL OXIDE |
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Classification
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Mineral
Classification: |
Oxides
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Strunz 8th
Ed. ID:
|
n/a
|
Nickel-Strunz 10th
Ed. ID:
|
4.DH.15
|
|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates) D : Metal: Oxygen = 1:2 and similar H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
|
Related
to: |
Pyrochlore
Subgroup. Microlite Group.
|
Members
of Supergroup: |
Pyrochlore
Supergroup: Betafite Group,
Elsmoreite Group, Microlite Group, Pyrochlore Group,
Roméite Group
|
Members
of Group: |
Microlite Group:
Fluorcalciomicrolite, Fluornatromicrolite, Hydrokenomicrolite,
Hydromicrolite, Hydroxykenomicrolite, Kenoplumbomicrolite,
Oxycalciomicrolite, Oxystannomicrolite, Oxystibiomicrolite
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Varieties: |
None
|
Synonyms: |
IMA1998-018
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Crystal
Data
|
|
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Crystallography:
|
Isometric
- Hexoctahedral
|
Crystal
Habit:
|
As
well formed octahedrons to about 15 mm.
|
Twinning:
|
None
known
|
|
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Physical
Properties
|
|
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Cleavage: |
n/a
|
Fracture: |
n/a
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Tenacity:
|
Brittle
|
Moh's
Hardness: |
n/a
|
Density:
|
n/a
|
Luminescence:
|
Not
Fluorescent |
Radioactivity:
|
Not
Radioactive
|
|
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Optical
Properties
|
|
|
Color: |
Yellowish-Orange
to Orangish Yellow, Emerald Green to deep Green
|
Transparency: |
Transparent
to Translucent
|
Luster: |
Adamantine
|
Refractive
Index: |
2.030
Isotropic
|
Birefringence: |
0.00
(Isotropic)
|
Dispersion: |
n/a
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Pleochroism: |
n/a
|
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Occurances
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Geological
Setting: |
Granitic pegmatite in biotite schist.
|
Common
Associations: |
Albite,
Lepidolite, (Paprok, Nuristan, Afghanistan); Albite,
Cleavlandite, Muscovite, Topaz (Shigar Valley, Skardu
District, Baltistan, Northern Areas, Pakistan); Albite,
Orthoclase (Mokrusha Mine, Yuzhakovo Village, Urals
Region, Russia) |
Common
Impurities: |
n/a
|
Type
Locality: |
Quixaba pegmatite, Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Northeast Region, Brazil
|
Year
Discovered: |
1998
(IMA approved 1998) |
View
mineral photos: |
Flournatromicrolite
Mineral Photos and Locations |
|
|
More
Information
|
|
|
|
Mindat.org
Webmineral.com
|
|
|
Fluornatromicrolite
is an extremely rare mineral and gem that is relatively
new. It was approved by the IMA in
1998. Fluornatromicrolite varies in color from
yellowish orange to deep green. It was first discovered
at the Quixaba pegmatite, Paraiba, Northeast Region,
Brazil. Crystals found at Alto Ligonha District, Zambezia
Province, Mozambique are typically deep green and rarely
transparent enough for faceting.
The
few sources of Fluornatromicrolite are: Paprok, Nuristan Province (Nurestan; Nooristan), Afghanistan;
Quixaba pegmatite, Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Northeast Region, Brazil;
Alto Ligonha pegmatites, Alto Ligonha District, Zambezia Province, Mozambique;
Shigar Valley, Skardu District, Baltistan, Northern Areas, Pakistan;
Mokrusha Mine, Alabashka
pegmatite field, Yuzhakovo Village, Ekaterinburgskaya (Sverdlovskaya)
Oblast', Middle Urals, Urals Region, Russia.
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Fluornatromicrolite
gems for sale:
|
Gem:
|
Fluornatromicrolite |
Stock
#:
|
FLNAT-001 |
Weight:
|
0.4480
ct |
Size: |
4.30
x 2.87
x 2.73 mm |
Shape: |
Custom
Cushion |
Color: |
Deep
Green |
Clarity: |
VVS |
Origin: |
Alto Ligonha,
Zambezia, Mozambique |
Treatment: |
None
(natural) |
Price: |
$538.00
[
Make an offer ] |
Pictures
are of the actual gem offered for
sale. Gem images are magnified to
show detail. |
|
|
A very rare gem from
Alto Ligonha, Zambezia Province, Mozambique.
This gem is quite large
and clean for the species with a very
attractive deep green color.
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