URGENT MESSAGE: Time is running out. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Hydroxylgugiaite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About HydroxylgugiaiteHide

Formula:
(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2
Colour:
Pale yellowish, white, grey
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.79 (Calculated)
Crystal System:
Tetragonal
Member of:
An H-bearing member of the melilite group. Closely related to gugiaite.
It occurs as a hydrothermal replacement of Be silicate minerals.


Classification of HydroxylgugiaiteHide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of HydroxylgugiaiteHide

Vitreous
Transparency:
Translucent
Colour:
Pale yellowish, white, grey
Streak:
White
Hardness:
Comment:
~5
Tenacity:
Brittle
Cleavage:
None Observed
No apparent cleavage
Density:
2.79 g/cm3 (Calculated)
Comment:
Density could not be measured due to lack of material

Optical Data of HydroxylgugiaiteHide

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.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of HydroxylgugiaiteHide

Formula:
(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2
IMA Formula:
(Ca3◻)Σ4(Si3.5Be2.5)Σ2O11(OH)3
Common Impurities:
K,Sr,Mg

Chemical AnalysisHide

Empirical formulas:
Sample IDEmpirical Formula
1(Ca2.82Na0.07Mn0.08Fe0.08Mg0.003.05(Si3.42Be2.45Al0.136O11[(OH)2.89F0.113
2(Ca2.76Na0.31Mn0.05Fe0.013.13(Si3.45Be2.53Al0.076.05O11[(OH)2.57F0.433
3(Ca2.88Na0.12Mn0.023.02(Si3.48Be2.49Al0.036O11[(OH)2.70F0.303

Crystallography of HydroxylgugiaiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.604(27)
2.971(34)
2.755(100)
2.348(17)
2.318(26)
2.212(26)
1.987(19)
1.706(22)

Occurrences of HydroxylgugiaiteHide

Paragenetic Mode(s):

Type Occurrence of HydroxylgugiaiteHide

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:
(Ca2.76Na0.31Mn0.05Fe0.013.13(Si3.45Be2.53Al0.076.05O11[(OH)2.57F0.433
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 HydroxylgugiaiteHide

Relationship of Hydroxylgugiaite to other SpeciesHide

Member of:
Other Members of this group:
ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
GugiaiteCa2Be(Si2O7)Tet.
HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
OkayamaliteCa2B(BSiO7)Tet.

Other InformationHide

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 HydroxylgugiaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J. & Kristiansen, R. (2013) Hydrogen in the Gugiaite Structure. SY1: Earth Materials, Petrological and Geochemical Processes (in Honour of Frank C. Hawthorne). Winnipeg 2013 http://www.gac.ca/wp/wp-content/uploads/2013/05/2013WinnipegGACMACAbstracts-merged.pdf
Grice, J., Kristiansen, R., Friis, H., Rowe, R., Cooper, M.,Poirier, G. and Yang, P. (2016) Hydroxylgugiaite, IMA 2016-009. CNMNC Newsletter No. 31, June 2016, page 696; Mineralogical Magazine, 80, 691–697.
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.

Internet Links for HydroxylgugiaiteHide

Localities for HydroxylgugiaiteHide

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.
Denmark (TL)
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
          • Taseq area
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.
Norway (TL)
 
  • Telemark
    • Porsgrunn
      • Langangen
        • Kokkersvold E18 roadcuts
Grice, J., Kristiansen, R., Friis, H., Rowe, R., Cooper, M., Poirier, G. and Yang, P. (2016) Hydroxylgugiaite, IMA 2016-009. CNMNC Newsletter No. 31, June 2016, page 696; Mineralogical Magazine, 80, 691–697; 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
      • Mørje
        • Sagåsen
Grice, J., Kristiansen, R., Friis, H., Rowe, R., Cooper, M., Poirier, G. and Yang, P. (2016) Hydroxylgugiaite, IMA 2016-009. CNMNC Newsletter No. 31, June 2016, page 696; Mineralogical Magazine, 80, 691–697; 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
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 21, 2018 16:43:34 Page generated: June 7, 2018 14:23:28
Go to top of page