Hydroastrophyllite
Valid as an unnamed mineral
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About Hydroastrophyllite
Formula:
[H3O]+2CaFe2+7Ti2[Si4O12]2O2(OH)4O
Hardness:
3 - 4
Crystal System:
Triclinic
Member of:
Astrophyllite Group.
Originally described from Sichuan Province.
Note:
Hydroastrophyllite was never approved by the CNMNC, and is thus not included in the IMA list of minerals.
Originally described from Sichuan Province.
Note:
Hydroastrophyllite was never approved by the CNMNC, and is thus not included in the IMA list of minerals.
Unique Identifiers
Mindat ID:
1964
Long-form identifier:
mindat:1:1:1964:0
IMA Classification of Hydroastrophyllite
IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.
Classification of Hydroastrophyllite
9.DC.05
9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
69.1.1.6
69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
14.9.30
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
Physical Properties of Hydroastrophyllite
Hardness:
3 - 4 on Mohs scale
Optical Data of Hydroastrophyllite
Type:
Biaxial (-)
RI values:
nα = 1.66 nβ = 1.72 nγ = 1.728
2V:
Measured: 40° , Calculated: 38°
Max. Birefringence:
δ = 0.068
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
weak
Chemistry of Hydroastrophyllite
Mindat Formula:
[H3O]+2CaFe2+7Ti2[Si4O12]2O2(OH)4O
Element Weights:
Common Impurities:
Al,Nb,Ta,Mg,Ba,Na,F,H2O
Crystallography of Hydroastrophyllite
Crystal System:
Triclinic
Cell Parameters:
a = 11.86 Å, b = 11.98 Å, c = 5.42 Å
α = 103.42°, β = 95.15°, γ = 112.2°
α = 103.42°, β = 95.15°, γ = 112.2°
Ratio:
a:b:c = 0.99 : 1 : 0.452
Unit Cell V:
679.94 ų (Calculated from Unit Cell)
Other Language Names for Hydroastrophyllite
German:Hydroastrophyllit
Spanish:Hidroastrofilita
Relationship of Hydroastrophyllite to other Species
Member of:
Other Members of Astrophyllite Group:
| Astrophyllite | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F | Tric. 1 : P1 |
| Bulgakite | Li2CaFe2+7Ti2[Si4O12]2O2(OH)4O(H2O)2 | Tric. 1 : P1 |
| Nalivkinite | Li2NaFe2+7Ti2[Si4O12]2O2(OH)4F(H2O)2 | Tric. 1 : P1 |
| Niobophyllite | K2NaFe2+7(NbTi)[Si4O12]2O2(OH)4O | Tric. |
| Tarbagataite | (K◻)CaFe2+7Ti2[Si4O12]2O2(OH)4(OH) | Tric. 1 : P1 |
| Zircophyllite | K2NaFe2+7Zr2[Si4O12]2O2(OH)4F | Tric. |
Common Associates
Associations Based on Photo Data:
| 11 photos of Hydroastrophyllite associated with Quartz | SiO2 |
| 4 photos of Hydroastrophyllite associated with 'Calcium-bearing Elpidite' | (Na,Ca)2ZrSi6O15 · 3H2O |
| 4 photos of Hydroastrophyllite associated with Aegirine | NaFe3+Si2O6 |
| 4 photos of Hydroastrophyllite associated with Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
| 3 photos of Hydroastrophyllite associated with Tarbagataite | (K◻)CaFe2+7Ti2[Si4O12]2O2(OH)4(OH) |
| 3 photos of Hydroastrophyllite associated with Zircon | Zr(SiO4) |
| 3 photos of Hydroastrophyllite associated with Microcline | K(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
| 9.DC. | Bulgakite | Li2CaFe2+7Ti2[Si4O12]2O2(OH)4O(H2O)2 |
| 9.DC.05 | Devitoite | Ba4Ba2Fe2+7Fe3+2[Si4O12]2[PO4]2[CO3]O2(OH)4◻2 |
| 9.DC.05 | Zircophyllite | K2NaFe2+7Zr2[Si4O12]2O2(OH)4F |
| 9.DC.05 | Nalivkinite | Li2NaFe2+7Ti2[Si4O12]2O2(OH)4F(H2O)2 |
| 9.DC.05 | Sveinbergeite | (H2O)2[Ca(H2O)](Fe2+6Fe3+)Ti2[Si4O12]2O2(OH)4[(OH)(H2O)] |
| 9.DC.05 | Niobophyllite | K2NaFe2+7(NbTi)[Si4O12]2O2(OH)4O |
| 9.DC.05 | Heyerdahlite | Na2NaMn2+7Ti2[Si4O12]2O2(OH)4F(H2O)2 |
| 9.DC.05 | Tarbagataite | (K◻)CaFe2+7Ti2[Si4O12]2O2(OH)4(OH) |
| 9.DC.05 | Astrophyllite | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| 9.DC.05 | Lobanovite | K2Na(Fe2+4Mg2Na)Ti2[Si4O12]2O2(OH)4◻ |
| 9.DC.05 | Niobokupletskite | K2NaMn2+7(NbTi)[Si4O12]2O2(OH)4O |
| 9.DC.05 | Kupletskite-(Cs) | Cs2NaMn2+7Ti2[Si4O12]2O2(OH)4F |
| 9.DC.05 | Kupletskite | K2NaMn2+7Ti2[Si4O12]2O2(OH)4F |
| 9.DC.05 | Laverovite | K2NaMn2+7Zr2[Si4O12]2O2(OH)4F |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hydroastrophyllite
mindat.org URL:
https://www.mindat.org/min-1964.html
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Please feel free to link to this page.
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References for Hydroastrophyllite
Reference List:
Localities for Hydroastrophyllite
Showing 7 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
China | |
| X-Ray Laboratory (1974) | |
Kazakhstan | |
| Pavel M. Kartashov |
Mongolia | |
| Mielke (n.d.) |
Norway | |
| Berge et al. (2002) |
Russia | |
| Voloshin et al. (2005) +1 other reference |
| ... | |
| Voloshin A.V. et al. (2004) |
Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia