Vote for your favorite mineral in #MinCup26! - Azurite vs. Smithsonite
It's carbonate-vs-carbonate to kick off Mineral Cup 2026 with copper-rich Azurite against zinc-rich Smithsonite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Hydroastrophyllite

Valid as an unnamed mineral
This page is currently not sponsored. Click here to sponsor this page.
06927300017271923957776.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
04345780017271923996330.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
02750970017271924033181.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
06927300017271923957776.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
04345780017271923996330.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
02750970017271924033181.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
00824060017271924083264.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
04345780017271923996330.jpg
Hydroastrophyllite, etc.

Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia
Hide all sections | Show all sections

About HydroastrophylliteHide

Formula:
[H3O]+2CaFe2+7Ti2[Si4O12]2O2(OH)4O
Hardness:
3 - 4
Crystal System:
Triclinic
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.


Unique IdentifiersHide

Mindat ID:
1964
Long-form identifier:
mindat:1:1:1964:0

IMA Classification of HydroastrophylliteHide

IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.

Classification of HydroastrophylliteHide

Strunz-mindat (2026):
9.DC.05

9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
Dana 8th ed.:
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)
Hey's CIM Ref.:
14.9.30

14 : Silicates not Containing Aluminum
9 : Silicates of Ti

Physical Properties of HydroastrophylliteHide

Hardness:
3 - 4 on Mohs scale

Optical Data of HydroastrophylliteHide

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.

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.

Surface Relief:
Moderate
Dispersion:
weak

Chemistry of HydroastrophylliteHide

Mindat Formula:
[H3O]+2CaFe2+7Ti2[Si4O12]2O2(OH)4O
Element Weights:
Element% weight
O40.946 %
Fe30.316 %
Si17.425 %
Ti7.424 %
Ca3.108 %
H0.782 %

Calculated from ideal end-member formula.
Elements listed:
Ca, Fe, H, O, Si, Ti - search for minerals with similar chemistry
Common Impurities:
Al,Nb,Ta,Mg,Ba,Na,F,H2O

Crystallography of HydroastrophylliteHide

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°
Ratio:
a:b:c = 0.99 : 1 : 0.452
Unit Cell V:
679.94 ų (Calculated from Unit Cell)

Other Language Names for HydroastrophylliteHide

Relationship of Hydroastrophyllite to other SpeciesHide

Member of:
Astrophyllite Group > Astrophyllite Supergroup
Other Members of Astrophyllite Group:
AstrophylliteK2NaFe2+7Ti2[Si4O12]2O2(OH)4FTric. 1 : P1
BulgakiteLi2CaFe2+7Ti2[Si4O12]2O2(OH)4O(H2O)2Tric. 1 : P1
NalivkiniteLi2NaFe2+7Ti2[Si4O12]2O2(OH)4F(H2O)2Tric. 1 : P1
NiobophylliteK2NaFe2+7(NbTi)[Si4O12]2O2(OH)4OTric.
Tarbagataite(K◻)CaFe2+7Ti2[Si4O12]2O2(OH)4(OH)Tric. 1 : P1
ZircophylliteK2NaFe2+7Zr2[Si4O12]2O2(OH)4FTric.

Common AssociatesHide

Associations Based on Photo Data:
11 photos of Hydroastrophyllite associated with QuartzSiO2
4 photos of Hydroastrophyllite associated with 'Calcium-bearing Elpidite'(Na,Ca)2ZrSi6O15 · 3H2O
4 photos of Hydroastrophyllite associated with AegirineNaFe3+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 ZirconZr(SiO4)
3 photos of Hydroastrophyllite associated with MicroclineK(AlSi3O8)

Related Minerals - Strunz-mindat GroupingHide

9.DC.BulgakiteLi2CaFe2+7Ti2[Si4O12]2O2(OH)4O(H2O)2Tric. 1 : P1
9.DC.05DevitoiteBa4Ba2Fe2+7Fe3+2[Si4O12]2[PO4]2[CO3]O2(OH)4◻2Tric. 1 : P1
9.DC.05ZircophylliteK2NaFe2+7Zr2[Si4O12]2O2(OH)4FTric.
9.DC.05NalivkiniteLi2NaFe2+7Ti2[Si4O12]2O2(OH)4F(H2O)2Tric. 1 : P1
9.DC.05Sveinbergeite(H2O)2[Ca(H2O)](Fe2+6Fe3+)Ti2[Si4O12]2O2(OH)4[(OH)(H2O)]Tric. 1 : P1
9.DC.05NiobophylliteK2NaFe2+7(NbTi)[Si4O12]2O2(OH)4OTric.
9.DC.05HeyerdahliteNa2NaMn2+7Ti2[Si4O12]2O2(OH)4F(H2O)2Tric. 1 : P1
9.DC.05Tarbagataite(K◻)CaFe2+7Ti2[Si4O12]2O2(OH)4(OH)Tric. 1 : P1
9.DC.05AstrophylliteK2NaFe2+7Ti2[Si4O12]2O2(OH)4FTric. 1 : P1
9.DC.05LobanoviteK2Na(Fe2+4Mg2Na)Ti2[Si4O12]2O2(OH)4◻Mon. 2/m : B2/m
9.DC.05NiobokupletskiteK2NaMn2+7(NbTi)[Si4O12]2O2(OH)4OTric. 1 : P1
9.DC.05Kupletskite-(Cs)Cs2NaMn2+7Ti2[Si4O12]2O2(OH)4FTric. 1 : P1
9.DC.05KupletskiteK2NaMn2+7Ti2[Si4O12]2O2(OH)4FTric. 1 : P1
9.DC.05LaveroviteK2NaMn2+7Zr2[Si4O12]2O2(OH)4FTric. 1 : P1

Other InformationHide

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 HydroastrophylliteHide

References for HydroastrophylliteHide

Localities for HydroastrophylliteHide

Showing 7 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Hide all sections | Show all sections

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
China
 
X-Ray Laboratory (1974)
Kazakhstan
 
  • Abai Region
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Pavel M. Kartashov
Mongolia
 
  • Ömnögovi Province
    • Khanbogd District
      • Khan Bogd Peralkaline Granite
Mielke (n.d.)
Norway
 
  • Vestfold
    • Sandefjord
      • Vesterøya
Berge et al. (2002)
Russia
 
  • Murmansk Oblast
    • Belye Tundry Massif
Voloshin et al. (2005) +1 other reference
...
    • Lovozersky District
      • Keivy Mountains
Voloshin A.V. et al. (2004)
Quick NavTopAbout HydroastrophylliteUnique IdentifiersIMA Classification Classification Physical Properties Optical Data Chemistry Crystallography Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 1, 2026 14:06:16 Page updated: August 18, 2026 02:41:16
Go to top of page