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Iwateite
A valid IMA mineral species
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About Iwateite
Formula:
Na2BaMn(PO4)2
Colour:
Colorless
Specific Gravity:
4.06 (Calculated)
Crystal System:
Trigonal
Name:
Named for the for the locality [Iwate Prefecture]
This page provides mineralogical data about Iwateite.
Unique Identifiers
Mindat ID:
43777
Long-form identifier:
mindat:1:1:43777:8
IMA Classification of Iwateite
Classification of Iwateite
8.AC.47
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Iw | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Iwateite
Transparency:
Translucent
Colour:
Colorless
Streak:
White
Density:
4.06 g/cm3 (Calculated)
Optical Data of Iwateite
Type:
Uniaxial
Pleochroism:
Weak
Comments:
Very weak
Chemistry of Iwateite
Mindat Formula:
Na2BaMn(PO4)2
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SO3 | 0.05 % |
| P2O5 | 32.48 % |
| SiO2 | 0.24 % |
| Al2O3 | 0.03 % |
| MnO | 16.44 % |
| MgO | 0.03 % |
| CaO | 0.14 % |
| SrO | 1.36 % |
| BaO | 34.84 % |
| Na2O | 13.71 % |
| K2O | 0.02 % |
| Total: | 99.34 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Ba0.99(Na1.92Sr0.06Ca0.01)Mn2+1.00[P0.995Si0.01O4]2 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Woods Mine, Inglis Co., New South Wales, Australia | sparse 30-50 micron grains embedded in coarse zoned mangano-mangani-ungarettiite/potassic-mangano-mangani-ungarettiite. |
Crystallography of Iwateite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 5.3642(10) Å, c = 7.039(2) Å
Ratio:
a:c = 1 : 1.312
Unit Cell V:
175.41 ų
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.032 Å | (39) |
| 4.646 Å | (67) |
| 3.877 Å | (48) |
| 2.807 Å | (100) |
| 2.683 Å | (74) |
| 2.506 Å | (46) |
| 1.939 Å | (91) |
| 1.571 Å | (33) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Iwateite
General Appearance of Type Material:
As granular to anhedral inclusions of 10-100 μm diameter within serandite crystals in the main manganese ore
Place of Conservation of Type Material:
Type material is deposited in the collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-M43779
Geological Setting of Type Material:
Ba-and Sr-bearing manganese deposit.
Associated Minerals at Type Locality:
Matsumaezawa pit, Tanohata mine, Tanohata, Shimohei District, Iwate Prefecture, Japan