Hydroxylgugiaite
A valid IMA mineral species
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About Hydroxylgugiaite
Formula:
(Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5]
Note that Grice et al., 2017 offer an idealized formula for their Norwegian material, which can be recast into the standard formula format for melilite group minerals, as (Ca1.5◻0.5)(Si0.8Be0.2)[Be1.05Si0.95O5.5(OH)1.5] (the T1 and T2 site occupancies shown here approximate their reported distributions).
However, they don't offer a more generalized end-member formula, one that could, for example, be used to plot exchange vectors. One possibility for an end-member composition could be (Ca1.5◻0.5)Si[BeSiO6(OH)], although this formula would represent a somewhat lower H content than that of the reported formula.
However, they don't offer a more generalized end-member formula, one that could, for example, be used to plot exchange vectors. One possibility for an end-member composition could be (Ca1.5◻0.5)Si[BeSiO6(OH)], although this formula would represent a somewhat lower H content than that of the reported formula.
Colour:
Pale yellowish, white, grey
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.79 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named for its relationship to the similar mineral gugiaite, but with the presence of hydroxyl ions.
An H-bearing member of the melilite group. Closely related to gugiaite.
It occurs as a hydrothermal replacement of Be silicate minerals.
It occurs as a hydrothermal replacement of Be silicate minerals.
Unique Identifiers
Mindat ID:
47040
Long-form identifier:
mindat:1:1:47040:9
GUID
(UUID V4):
(UUID V4):
5f07bf17-cb6a-49fc-b3d1-07deee1112a0
IMA Classification of Hydroxylgugiaite
Approved
IMA Formula:
(Ca3◻)Σ4(Si3.5Be2.5)Σ6O11(OH)3
Approval year:
2016
First published:
2017
Type description reference:
Grice, Joel D., Kristiansen, Roy, Friis, Henrik, Rowe, Ralph, Cooper, Mark A., Poirier, Glenn G., Yang, Panseok, Weller, Mark T. (2017) Hydroxylgugiaite: A New Beryllium Silicate Mineral From the Larvik Plutonic Complex, Southern Norway and the Ilímaussaq Alkaline Complex, South Greenland; The First Member of the Melilite Group To Incorporate A Hydrogen Atom. The Canadian Mineralogist, 55 (2) 219-232 doi:10.3749/canmin.1700002
Classification of Hydroxylgugiaite
9.BB.10
9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
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 |
|---|---|---|
| Hgug | 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 Hydroxylgugiaite
Vitreous
Transparency:
Translucent
Colour:
Pale yellowish, white, grey
Streak:
White
Hardness:
5 on Mohs scale
Comment:
~5
Tenacity:
Brittle
Cleavage:
None Observed
No apparent cleavage
No apparent cleavage
Density:
2.79 g/cm3 (Calculated)
Comment:
Density could not be measured due to lack of material
Optical Data of Hydroxylgugiaite
Type:
Uniaxial (+)
RI values:
nω = 1.620 - 1.624 nε = 1.630 - 1.634
Birefringence:
Low
Max Birefringence:
δ = 0.010
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
Pleochroism:
Non-pleochroic
Chemistry of Hydroxylgugiaite
Mindat Formula:
(Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5]
Note that Grice et al., 2017 offer an idealized formula for their Norwegian material, which can be recast into the standard formula format for melilite group minerals, as (Ca1.5◻0.5)(Si0.8Be0.2)[Be1.05Si0.95O5.5(OH)1.5] (the T1 and T2 site occupancies shown here approximate their reported distributions).
However, they don't offer a more generalized end-member formula, one that could, for example, be used to plot exchange vectors. One possibility for an end-member composition could be (Ca1.5◻0.5)Si[BeSiO6(OH)], although this formula would represent a somewhat lower H content than that of the reported formula.
Note that Grice et al., 2017 offer an idealized formula for their Norwegian material, which can be recast into the standard formula format for melilite group minerals, as (Ca1.5◻0.5)(Si0.8Be0.2)[Be1.05Si0.95O5.5(OH)1.5] (the T1 and T2 site occupancies shown here approximate their reported distributions).
However, they don't offer a more generalized end-member formula, one that could, for example, be used to plot exchange vectors. One possibility for an end-member composition could be (Ca1.5◻0.5)Si[BeSiO6(OH)], although this formula would represent a somewhat lower H content than that of the reported formula.
Common Impurities:
K,Sr,Mg
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Ca2.82Na0.07Mn0.08Fe0.08Mg0.00)Σ3.05(Si3.42Be2.45Al0.13)Σ6O11[(OH)2.89F0.11]Σ3 |
| 2 | (Ca2.76Na0.31Mn0.05Fe0.01)Σ3.13(Si3.45Be2.53Al0.07)Σ6.05O11[(OH)2.57F0.43]Σ3 |
| 3 | (Ca2.88Na0.12Mn0.02)Σ3.02(Si3.48Be2.49Al0.03)Σ6O11[(OH)2.70F0.30]Σ3 |
Sample references:
Crystallography of Hydroxylgugiaite
Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
P4 21m
Cell Parameters:
a = 7.415(1) Å, c = 4.965(2) Å
Ratio:
a:c = 1 : 0.67
Unit Cell V:
272.9 ų
Z:
2
Morphology:
Rod-like crystals, anhedral grains and rarely as euhedral crystals, with a flattened pillow-shaped tetragonal dipyramid form. Squat dipyramids {111} or as elongate tetragonal prisms.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.604 Å | (27) |
| 2.971 Å | (34) |
| 2.755 Å | (100) |
| 2.348 Å | (17) |
| 2.318 Å | (26) |
| 2.212 Å | (26) |
| 1.987 Å | (19) |
| 1.706 Å | (22) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Hydroxylgugiaite
Co-Type Localities:
General Appearance of Type Material:
As squat dipyramids (30 × 50 μm) or as elongate tetragonal prisms.
Place of Conservation of Type Material:
In the mineralogical collections of the Canadian Museum of Nature, Ottawa, Canada, registration number CMNMC 86555
Empirical Formula of Type Material:
(Ca2.76Na0.31Mn0.05Fe0.01)Σ3.13(Si3.45Be2.53Al0.07)Σ6.05O11[(OH)2.57F0.43]Σ3
Geological Setting of Type Material:
Syenite pegmatite
Reference:
Grice, J. D., Kristiansen, R. Friis, H., Rowe, R. , Cooper, M. A. , Poirier, G. G. , Yang, P. & ,Weller, M.T. (2017) Hydroxylgugiaite: A new beryllium silicate mineral from the Larvik Plutonic Complex, southern Norway and the Ilímaussaq alkaline complex, South Greenland; the first member of the melilite group to incorporate a hydrogen atom. Canadian Mineralogist: 55: 219-232.
Synonyms of Hydroxylgugiaite
Relationship of Hydroxylgugiaite to other Species
Member of:
Other Members of this group:
| Åkermanite | Ca2Mg[Si2O7] | Tet. 4 2m : P4 21m |
| Alumoåkermanite | (CaNa)Al[Si2O7] | Tet. 4 2m : P4 21m |
| Bennesherite | Ba2Fe2+[Si2O7] | Tet. 4 2m : P4 21m |
| Ferri-gehlenite | Ca2Fe3+[AlSiO7] | |
| Gehlenite | Ca2Al[AlSiO7] | Tet. 4 2m : P4 21m |
| Gugiaite | Ca2Be[Si2O7] | Tet. 4 2m : P4 2m |
| Hardystonite | Ca2Zn[Si2O7] | Tet. 4 2m : P4 21m |
| Okayamalite | Ca2B[BSiO7] | Tet. 4 2m : P4 21m |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.BB.10 | Åkermanite | Ca2Mg[Si2O7] |
| 9.BB.10 | Cebollite | Ca5Al2(SiO4)3(OH)4 |
| 9.BB.10 | Gehlenite | Ca2Al[AlSiO7] |
| 9.BB.10 | Gugiaite | Ca2Be[Si2O7] |
| 9.BB.10 | Hardystonite | Ca2Zn[Si2O7] |
| 9.BB.10 | Jeffreyite | (Ca,Na)2(Be,Al)(Si2O7,HSi2O7) |
| 9.BB.10 | Okayamalite | Ca2B[BSiO7] |
| 9.BB.10 | Ferri-gehlenite | Ca2Fe3+[AlSiO7] |
| 9.BB.10 | Alumoåkermanite | (CaNa)Al[Si2O7] |
| 9.BB.15 | Barylite | Be2Ba(Si2O7) |
| 9.BB.15 | Barylite-1O | Be2Ba(Si2O7) |
| 9.BB.20 | Andrémeyerite | BaFe2+2(Si2O7) |
| 9.BB.20 | Bennesherite | Ba2Fe2+[Si2O7] |
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.
Internet Links for Hydroxylgugiaite
mindat.org URL:
https://www.mindat.org/min-47040.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Hydroxylgugiaite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 31. Mineralogical Magazine, 80 (4) 691-697 doi:10.1180/minmag.2016.080.083
Grice, Joel D., Kristiansen, Roy, Friis, Henrik, Rowe, Ralph, Cooper, Mark A., Poirier, Glenn G., Yang, Panseok, Weller, Mark T. (2017) Hydroxylgugiaite: A New Beryllium Silicate Mineral From the Larvik Plutonic Complex, Southern Norway and the Ilímaussaq Alkaline Complex, South Greenland; The First Member of the Melilite Group To Incorporate A Hydrogen Atom. The Canadian Mineralogist, 55 (2) 219-232 doi:10.3749/canmin.1700002
Localities for Hydroxylgugiaite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Greenland (TL) | |
| Grice et al. (2017) |
Italy | |
| Rivista Mineralogica Italiana 46 |
Norway (TL) | |
| Mineralogical Magazine +2 other references |
| Mineralogical Magazine +2 other references |
| Grice et al. (2017) |
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Saga 1 Quarry, Sagåsen, Auenlandet, Porsgrunn, Telemark, Norway