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Galliskiite

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Formula:
Ca4Al2(PO4)2F8 · 5H2O
Colour:
colorless
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.67
Crystal System:
Triclinic
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.


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Classification of GalliskiiteHide

Approved
Approval Year:
2009
42.2.2.5

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
2 : (AB)3(XO4)Zq·xH2O

Physical Properties of GalliskiiteHide

Vitreous
Transparency:
Transparent
Colour:
colorless
Streak:
White
Hardness:
2½ on Mohs scale
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)

Optical Data of GalliskiiteHide

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 GalliskiiteHide

Formula:
Ca4Al2(PO4)2F8 · 5H2O

Crystallography of GalliskiiteHide

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 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 DiffractionHide

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)

Type Occurrence of GalliskiiteHide

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:

Synonyms of GalliskiiteHide

Other Language Names for GalliskiiteHide

Related Minerals - Dana Grouping (8th Ed.)Hide

42.2.2.1RanunculiteHAl(UO2)(PO4)(OH)3 · 4H2OMon.

Fluorescence of GalliskiiteHide

Other InformationHide

Notes:
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 GalliskiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 GalliskiiteHide

Localities for GalliskiiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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