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Galliskiite

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Formula:
Ca4Al2(PO4)2F8 · 5H2O
System:
Triclinic
Colour:
colorless
Hardness:
Name:
To honor Miguel Ángel Galliski (b. 1948), Argentine mineralogist and pegmatite specialist whose research on the pegmatites of the Pampean Pegmatite Province of northwestern Argentina.
This page provides mineralogical data about Galliskiite.

Classification of Galliskiite

Approved
Approval Year:
2009
42.2.2.5

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
2 : (AB)3(XO4)Zq·xH2O
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http://www.mindat.org/min-39639.html
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Type Occurrence of Galliskiite

General Appearance of Type Material:
crystals growing on a drusy layer of morinite covering triplite. forms massive intergrown vein fillings in triplite, but always separated from it by morinite. Clearly galliskiite is a late-stage hydrothermal mineral that crystallized from fluorine-rich so
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, with catalog number 62500
Geological Setting of Type Material:
Intragranitic pegmatites related to the Achala batholith. The parental magma was rich in fluorine.
Associated Minerals at Type Locality:

Physical Properties of Galliskiite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
colorless
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
two fair cleavages at ~90° (probably {010} and {001}).
Parting:
none
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.67(3) g/cm3 (Measured)    2.670 g/cm3 (Calculated)

Crystallography of Galliskiite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.1933(7) Å, b = 9.871(1) Å, c = 13.580(2) Å
α = 89.716(3)°, β = 75.303(4)°, γ = 88.683(4)°
Ratio:
a:b:c = 0.627 : 1 : 1.376
Unit Cell Volume:
V 802.82 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Simple contact and polysynthetic twinning on {100} by rotation about [010] is ubiquitous.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.904 (70)
5.994 (100)
3.280 (58)
3.113 (30)
2.945 (82)
2.887 (44)
2.262 (27)
1.821 (27)

Optical Data of Galliskiite

Type:
Biaxial (+)
RI values:
nα = 1.493(1) nβ = 1.495(1) nγ = 1.520(1)
2V:
Measured: 33° (5), Calculated: 32°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
moderate r < v
Pleochroism:
Non-pleochroic

Chemical Properties of Galliskiite

Formula:
Ca4Al2(PO4)2F8 · 5H2O
All elements listed in formula:

Other Names for Galliskiite

Name in Other Languages:

Other Information

Other Information:
dissolves slowly in concentrated HCl
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 Galliskiite

Reference List:
Kampf, A.R., Colombo, F., Simmons, W.B., Jr., Falster, A., Nizamoff, J.W. (2010): Galliskiite, Ca4Al2(PO4)2F8·5H2O, a new mineral from the Gigante granitic pegmatite, Cordoba province, Argentina. American Mineralogist, 95:392-396.

Internet Links for Galliskiite

Localities for Galliskiite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina (TL)
 
  • Córdoba
    • Punilla Department
IMA Approvals - August 2009; Kampf, A.R., F. Colombo, W.B. Simmons Jr., A. Falster, J.W. Nizamoff (2010): Galliskiite, Ca4Al2(PO4)2F8 x 5H2O, a new mineral from the Gigante granitic pegmatite, Cordoba province, Argentina. American Mineralogist. 95, 392-96
Mineral and/or Locality  
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