Gearksutite
A valid IMA mineral species - grandfathered
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About Gearksutite
Formula:
Ca[Al(F,OH)5(H2O)]
Colour:
white, pale rose, colourless (including in transmitted light)
Lustre:
Dull
Hardness:
2
Specific Gravity:
2.768
Crystal System:
Triclinic
Name:
From the Greek γή, earth, and arksutite (chiolite), which it was thought to resemble in composition, in allusion to the earthy character of the material.
Unique Identifiers
Mindat ID:
1663
Long-form identifier:
mindat:1:1:1663:2
GUID
(UUID V4):
(UUID V4):
de879678-9f59-4cc3-80fb-2bc30cf79969
IMA Classification of Gearksutite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaAlF4(OH) · H2O
Classification of Gearksutite
3.CC.05
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
11.6.8.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.12
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Gak | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gearksutite
Dull
Transparency:
Transparent, Opaque
Colour:
white, pale rose, colourless (including in transmitted light)
Comment:
transparent in thin fibers
Streak:
white
Hardness:
2 on Mohs scale
Cleavage:
Imperfect/Fair
On {110}.
On {110}.
Density:
2.768 g/cm3 (Measured) 2.771 g/cm3 (Calculated)
Optical Data of Gearksutite
Type:
Biaxial (-)
RI values:
nα = 1.448 nβ = 1.454 nγ = 1.456
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v distinct
Chemistry of Gearksutite
Mindat Formula:
Ca[Al(F,OH)5(H2O)]
Crystallography of Gearksutite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 4.940(1) Å, b = 6.810(1) Å, c = 6.978(1) Å
α = 101.12°, β = 94.86°, γ = 110.07°
α = 101.12°, β = 94.86°, γ = 110.07°
Ratio:
a:b:c = 0.725 : 1 : 1.025
Unit Cell V:
213.43 ų
Z:
2
Morphology:
Massive; nodular with an earthy to chalky character. Consisting of very minute needles with inclined extinction.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0002346 | Gearksutite | Marchetti F, Perchiazzi N (2000) The crystal structure of gearksutite, CaAlF4(OH).H2O American Mineralogist 85 231-235 | 2000 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.54 Å | (10) |
3.33 Å | (7d) |
3.14 Å | (8) |
2.28 Å | (8) |
2.15 Å | (6) |
1.924 Å | (8) |
1.741 Å | (6) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites | |
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Gearksutite
Synonyms of Gearksutite
Other Language Names for Gearksutite
German:Gearksutit
Russian:Геарксутит
Simplified Chinese:氟铝钙矿
Spanish:Gearksutita
Traditional Chinese:氟鋁鈣礦
Common Associates
Associated Minerals Based on Photo Data:
21 photos of Gearksutite associated with Creedite | Ca3SO4Al2F8(OH)2 · 2H2O |
14 photos of Gearksutite associated with Fluorite | CaF2 |
12 photos of Gearksutite associated with Quartz | SiO2 |
10 photos of Gearksutite associated with Prosopite | CaAl2F4[(OH)4-xFx] |
6 photos of Gearksutite associated with Weberite | Na2Mg[AlF6]F |
4 photos of Gearksutite associated with Linarite | PbCu(SO4)(OH)2 |
3 photos of Gearksutite associated with Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 |
3 photos of Gearksutite associated with Cerussite | PbCO3 |
3 photos of Gearksutite associated with Siderite | FeCO3 |
3 photos of Gearksutite associated with Azurite | Cu3(CO3)2(OH)2 |
Related Minerals - Strunz-mindat Grouping
3.CC.10 | Acuminite | Sr[AlF4(OH)(H2O)] |
3.CC.10 | Tikhonenkovite | Sr[AlF4(OH)(H2O)] |
3.CC.15 | Artroeite | Pb[AlF3(OH)2] |
3.CC.20 | Calcjarlite | Na(Ca,Sr)3Al3(OH)2F14 |
3.CC.20 | Jarlite | Na(Sr,Na)7MgAl6F32(OH,H2O)2 |
3.CC.20 | Jørgensenite | Na2(Sr,Ba)14Na2Al12F64(OH,F)4 |
Fluorescence of Gearksutite
Compact, massive material fluoresces dark violet to bluish gray; powdery material fluoresces yellowish brown.
Other Information
Notes:
Readily soluble in dilute acid.
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 Gearksutite
mindat.org URL:
https://www.mindat.org/min-1663.html
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Please feel free to link to this page.
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References for Gearksutite
Reference List:
Simpson, E.S. (1920) On Gearksutite at Gingin, Western Australia. Mineralogical Magazine: 19: 23-39.
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin Vol. 679. US Geological Survey doi:10.3133/b679 p.78
Fleischer, M., Rooseboom, E. H., Skinner, Brian (1960) New Mineral Names; New data; Discredited minerals. American Mineralogist, 45 (9-10) 1130-1136
(1962) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (258) 260-263 doi:10.1180/minmag.1962.033.258.09
Localities for Gearksutite
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).
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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Am Min 85:231-235 +1 other reference |
| Edward S. Simpson (1920) +1 other reference |
Austria | |
| Program and Abstracts Volume +2 other references |
| Kolitsch (2016) |
Bolivia | |
| Walenta et al. (1980) +1 other reference |
China | |
| Niedermayr (2004) |
| Mingyue He et al. (2002) |
Finland | |
| Ilkka Mikkola collection |
Germany | |
| 58 +6 other references |
| Gröbner et al. (2011) |
| Möhn et al. (07/2020) |
Greece | |
| |
Wendel (2000) +2 other references | |
| Branko Rieck collection |
| Kolitsch et al. (2014) |
Greenland (TL) | |
| Palache et al. (1951) +2 other references |
Italy | |
| Russo et al. (2014) +1 other reference |
Russo et al. (2014) +1 other reference | |
| Russo et al. (2011) +2 other references |
Campostrini et al. (2019) | |
| Bortolozzi et al. (2018) |
| Prof. P. Orlandi personal communication ... |
| Bernauer (1941) |
Campostrini et al. (2011) | |
Bernauer (1941) +2 other references | |
| Bortolozzi et al. (2021) |
| AA.VV. (1996) |
| Biagioni et al. (2013) |
Biagioni et al. (2013) | |
| Menchetti et al. (2015) |
| Boscardin M. et al. (1995) +1 other reference |
American Mineralogist | |
Pegoraro S. (2014) | |
| Neschen (n.d.) |
Kazakhstan | |
| Pavel.M. Kartashov (n.d.) +1 other reference |
| Evseev (1995) +2 other references |
| Pavel.M. Kartashov (n.d.) |
Kyrgyzstan | |
| Kolesar et al. (1993) |
Mexico | |
| Megaw (2023) |
| Panczner (1987) |
Norway | |
| Dietrich et al. (1965) +1 other reference |
Russia | |
| webmineral.ru (2016) |
M.M. Povilaitis data (http://klopotow.narod.ru/mindata/locathn/R_Buryat/zakamensk/djida.html) | |
| Bailey |
Arkhipchuk (1971) | |
| Ripp et al. (1996) +1 other reference |
| Bailey +1 other reference |
| Pekov (1998) |
| Pekov (1998) |
| Bailey |
Pavel.M. Kartashov (n.d.) +1 other reference | |
| Pavel.M. Kartashov (n.d.) |
| P.M. Karashov data |
South Africa | |
| Rocks & Minerals 83:5 pp 410-421 +1 other reference |
| Robert O. Meyer collection +2 other references |
Spain | |
| Calvo (2006) |
| Rodríguez +4 other references |
| Rosell et al. (2017) |
UK | |
| Norman Wilson collection. |
| Norman Wilson personal collection |
Ukraine | |
| Bailey +1 other reference |
USA | |
| Rob Bowell |
Rob Bowell | |
| Jones (1980) +1 other reference |
| Eckel et al. (1997) |
Eckel et al. (1997) | |
| Eckel et al. (1997) |
| Palache et al. (1951) +1 other reference |
Gross et al. (1966) | |
Pavel M. Kartashov analytical data (2012) | |
Gross et al. (1966) | |
| Eckel et al. (1997) |
| Palache et al. (1951) +1 other reference |
| 2009 New Mexico Mineral Symposium ... +1 other reference |
| Castor et al. (2004) |
| Walstrom (n.d.) +1 other reference |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) |
| Kearns et al. (2000) |
| The System of Mineralogy of James ... +3 other references |
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Qinglong County, Qianxinan, Guizhou, China