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Astrophyllite

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Formula:
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
System:
Triclinic
Colour:
Bronze-yellow, golden ...
Lustre:
Greasy, Pearly, Sub-Metallic
Hardness:
3
Name:
From the Greek άστρον ("astron") for "star" and φύλλον ("phyllon") for "leaf", in allusion to its habit of starburst-like sprays and micaceous cleavage.

Classification of Astrophyllite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.DC.05

9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
69.1.1.1

69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
14.9.29

14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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Type Occurrence of Astrophyllite

Place of Conservation of Type Material:
Mineralogische Sammlung der TU Bergakademie Freiberg
Year of Discovery:
1844
Geological Setting of Type Material:
Nepheline-syenite pegmatite

Occurrences of Astrophyllite

Geological Setting:
Nepheline syenites and alkali granites.

Physical Properties of Astrophyllite

Greasy, Pearly, Sub-Metallic
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
Bronze-yellow, golden yellow, brown to reddish brown.
Streak:
Golden
Hardness (Mohs):
3
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}
Poor on {100}
Fracture:
Irregular/Uneven
Density:
3.2 - 3.4 g/cm3 (Measured)    

Crystallography of Astrophyllite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 11.76Å, b = 5.36Å, c = 21.08Å
α = 90°, β = 94°, γ = 90°
Ratio:
a:b:c = 2.194 : 1 : 3.933
Morphology:
tabular, bladed, acicular
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Astrophyllite

Type:
Biaxial (+)
RI values:
nα = 1.680 nβ = 1.700 nγ = 1.730
2V:
Measured: 70° to 90°, Calculated: 80°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
none
Pleochroism:
Strong
Comments:
X= deep red-orange
Y= orange-yellow
Z= lemon-yellow

Chemical Properties of Astrophyllite

Formula:
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
Essential elements:
All elements listed in formula:
Common Impurities:
Nb,Ta,Zr,Al,Mg,Ca

Relationship of Astrophyllite to other Species

Series:
Forms a series with Kupletskite (see here)
Other Members of Group:
BulgakiteLi2(Ca,Na)Fe72+Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2
Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31
Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F
Kupletskite-(Cs)(Cs,K,Na)3(Mn,Fe2+)7(Ti,Nb)2Si8O24(O,OH,F)7
Magnesioastrophyllite(Na,K)4Mg2(Fe,Fe,Mn)5Ti2Si8O24(O,OH,F)7
NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4F
NiobokupletskiteK2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F)
Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31
SveinbergeiteCa(Fe62+Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4
Tarbagataite(K□)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5
Zircophyllite(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
9.DC.05Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31
9.DC.05Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F
9.DC.05Magnesioastrophyllite(Na,K)4Mg2(Fe,Fe,Mn)5Ti2Si8O24(O,OH,F)7
9.DC.05Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31
9.DC.05Zircophyllite(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
9.DC.05Kupletskite-(Cs)(Cs,K,Na)3(Mn,Fe2+)7(Ti,Nb)2Si8O24(O,OH,F)7
9.DC.05NiobokupletskiteK2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F)
9.DC.05NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4F
9.DC.05SveinbergeiteCa(Fe62+Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4
14.9.1NatisiteNa2Ti(SiO4)O
14.9.2LorenzeniteNa2Ti2(Si2O6)O3
14.9.3LintisiteLiNa3Ti2(Si2O6)2O2 · 2H2O
14.9.4DavaniteK2TiSi6O15
14.9.5KazakoviteNa6Mn2+Ti(Si6O18)
14.9.6TitaniteCaTi(SiO4)O
14.9.7OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O
14.9.8Lamprophyllite(Sr,K,Ba)2(Na,Ti,Mn2+,Fe3+)4Ti2(Si2O7)2O(O,OH,F)
14.9.9BenitoiteBaTi(Si3O9)
14.9.10BatisiteBaNaNaTi2(Si4O12)O2
14.9.11FresnoiteBa2Ti(Si2O7)O
14.9.12Joaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2O
14.9.13Orthojoaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O
14.9.14StrontiojoaquiniteSr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2O
14.9.15Bario-orthojoaquinite(Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2O
14.9.16Strontio-orthojoaquinite(Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O
14.9.17BafertisiteBa(Fe2+,Mn2+)2Ti(Si2O7)O(F,OH)2
14.9.18HejtmaniteBa(Mn2+,Fe2+)2Ti(Si2O7)O(OH,F)
14.9.19Delindeite(Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2O
14.9.20Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
14.9.21Trimounsite-(Y)Y2Ti2(SiO4)O5
14.9.22Perrierite-(Ce)(Ce,Ca,Th)4(Fe2+,Mg)Fe23+(Ti,Fe3+)2(Si2O7)2O8
14.9.23Chevkinite(Ce,Ca,Th)4(Fe,Mn)2(Ti,Fe)3[Si2O7]2O8
14.9.24Strontiochevkinite(Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8
14.9.25TisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O
14.9.26NeptuniteNa2KLi(Fe2+,Mn2+)2Ti2(Si8O24)
14.9.27ManganoneptuniteNa2KLi(Mn2+,Fe2+)2Ti2[Si8O24]
14.9.28Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F
14.9.30Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31
14.9.31Magnesioastrophyllite(Na,K)4Mg2(Fe,Fe,Mn)5Ti2Si8O24(O,OH,F)7
14.9.32BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
14.9.34AenigmatiteNa2Fe52+Ti(Si6O18)O2
14.9.35SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
14.9.36TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]
14.9.37Janhaugite(Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2
14.9.38KoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2O

Other Names for Astrophyllite

Name in Other Languages:

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.

References for Astrophyllite

Reference List:
Weibye, P.C. (1848): Beiträge zur topographischen Mineralogie Norwegens. Archiv für Mineralogie, Geognosie, Bergbau und Hüttenkunde. 22, 673-678

Scheerer, T. (1854): Verhandlungen des bergmännischen Vereins zu Freiberg, Berg- und hüttenmännische Zeitung. 13, 239-240

Scheerer, T. (1864): Über den Astrophyllit und sein Verhältnis zu Augit und Glimmer im Zirkonsyenit. Annalen der Physik und Chemie. 198 (2/122), 107-138

Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit- und Nephelinsyenite, Zeitschrift für Kristallographie und Mineralogie 16,.1-663.

Zhesheng Ma, Guowu Li, Nicheng Shi, Huyun Zhou, Danian Ye, and Pushcharovsky, D.Y. (2001): Structure refinement of astrophyllite. Science in China, Series D (Earth Sciences) 44(6), 508-516.

Piilonen, P., Lalonde, A., McDonald, A., Gault, R, Larsen, A. (2003): Insights into Astrophyllite-group minerals. I. Nomenclature, composition and development of standardized general formula, Canadian Mineralogist, Vol. 41, 1-26

Acta Crystallographica: 22: 673-678.

Internet Links for Astrophyllite

Specimens:
The following Astrophyllite specimens are currently listed for sale on minfind.com.

Localities for Astrophyllite

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Mineral and/or Locality  
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