Classification of Oxykinoshitalite |
| IMA status: | Approved 2004 |
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| Strunz 8th edition ID: | 8/H.12-28
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| Nickel-Strunz 10th (pending) edition ID: | 9.EC.35
9 : SILICATES (Germanates) E : Phyllosilicates C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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| mindat.org URL: | http://www.mindat.org/min-27464.html Please feel free to link to this page. |
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Type Occurrence of Oxykinoshitalite |
| Type Locality: | Fernando de Noronha island, Fernando de Noronha archipelago, Pernambuco, Brazil |
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| General Appearance of Type Material: | corroded irregularly shaped grains, 0.03 to 0.05 mm across |
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| Geological Setting of type material: | olivine nephelinite |
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| Associated Minerals at type locality: | |
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Physical Properties of Oxykinoshitalite |
| Lustre: | Vitreous |
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| Colour: | Bright orange to brown |
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| Streak: | Brown |
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| Hardness (Mohs): | 2½ |
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| Tenacity: | Brittle |
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| Cleavage: | Perfect on {001} |
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| Fracture: | Splintery |
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| Density (measured): | 3.3 g/cm3 |
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| Density (calculated): | 3.45 g/cm3 |
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Crystallography of Oxykinoshitalite |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | B2/m {B1 1 2/m} {C2/m} {C1 2/m 1} |
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| Cell Parameters: | a = 5.3516Å, b = 9.2817Å, c = 10.0475Å β = 100.337° |
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| Ratio: | a:b:c = 0.577 : 1 : 1.083 |
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| Unit Cell Volume: | V 490.98 ų |
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| Z: | 2 |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 2.637 | | (10) | | 2.172 | | (9) | | 3.646 | | (7) | | 3.130 | | (7) | | 3.383 | | (6) | | 2.902 | | (5) | | 2.435 | | (5) | | 1.988 | | (5) | | 1.661 | | (5) | | 1.547 | | (5) | | 1.526 | | (5) |
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| Comments: | Format: d/Å (I/%) (hkl), from type description |
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Optical Data of Oxykinoshitalite |
| Type: | Biaxial (+) |
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| RI values: | nα = 1.707 - 1.709 nβ = 1.709 - 1.711 nγ = 1.718 - 1.720 |
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| 2V: | Measured: 54° to 58°, Calculated: 51° |
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| Maximum Birefringence: | δ = 0.011
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | High |
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| Pleochroism: | Strong |
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| Comments: | X pale brown, Y ≈ Z deep red-brown
X ∧ c = 2° (in β obtuse), Y = b, Z ∧ a = 8° (in β obtuse)
absorption X < Y ≈ Z |
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Chemical Properties of Oxykinoshitalite |
| Formula: | | (Ba,K)(Mg,Ti,Fe | | ,Fe | | ) | | ((Si,Al) | | O | | )(O,OH,F) | | |
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| Essential elements: | Ba, Mg, O, Si |
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| All elements listed in formula: | Al, Ba, F, Fe, H, K, Mg, O, Si, Ti |
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| Analytical Data: | The mineral was analysed by electron microprobe analysis (EMPA) and secondary ion mass spectrometry (SIMS)
The formula unit was calculated on the basis of 12 oxide, hydroxide and fluoride ions
SiO2 (28.92)
Al2O3 (15.26)
TiO2 (11.94)
Cr2O3 (0.03)
Fe2O3 (9.07)
FeO (3.84)
MnO (0.14)
MgO (10.74)
CaO (0.03)
BaO (15.49)
Na2O (0.39)
K2O (4.05)
F (0.91)
H2O (0.55)
sum 100.97 wt.%
V, Ni, Zn, Sr and Cl were not detected (LOD's not given) |
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| Empirical Formula: | | (Ba | | K | | Na | | ) | | (Mg | | Fe | | Mn | | Fe | | Ti | | ) | | (Si | | Al | | ) | | O | | [O | | (OH) | | F | | ] | | |
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Relationship of Oxykinoshitalite to other Species |
| Member of: | Mica Group |
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Other Members of Group:
- + | |
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Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Oxykinoshitalite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Fluorescence in UV light: | None |
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| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Oxykinoshitalite |
Reference List:
- + | Kogarko, L.N., Uvarova, Yu.A., Sokolova, E., Hawthorne, F.C., Ottolini, L., Grice, J.D. (2005): Oxykinoshitalite, a new species of mica from Fernando-do-Noronha Island, Brazil: occurrence and crystal structure. Canadian Mineralogist, 43, 1501-1510.
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Internet Links for Oxykinoshitalite |
| Search Engines: |
Look for Oxykinoshitalite on Google
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| External Links: | Look for Oxykinoshitalite on WebmineralLook for Oxykinoshitalite on Athena Mineralogy [Link dead]Look for Oxykinoshitalite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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| Jobs: | Mining & Geology Jobs |
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Localities for Oxykinoshitalite |
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