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Fontarnauite

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Formula:
(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2O
Colour:
colorless to light brown
Lustre:
Pearly
Hardness:
2½ - 3
Specific Gravity:
2.37
Crystal System:
Monoclinic
Name:
Named in honour of Ramon Fontarnau i Griera (1944-2007), materials scientist at the University of Barcelona, who made important contributions to the mineralogy of Spain.
Unique combination of elements (the only Sr-S-B mineral currently known).


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Classification of FontarnauiteHide

Approved
Approval Year:
2014
6.DA.60

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
27.1.13.

27 : COMPOUND BORATES
1 : Miscellaneous

Physical Properties of FontarnauiteHide

Pearly
Transparency:
Transparent, Translucent
Colour:
colorless to light brown
Streak:
white
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Fracture:
Splintery
Density:
2.37 g/cm3 (Measured)    2.533 g/cm3 (Calculated)
Comment:
Measured is low due to included probertite

Optical Data of FontarnauiteHide

Type:
Biaxial (-)
RI values:
nα = 1.517(2) nβ = 1.539(2) nγ = 1.543(2)
2V:
Measured: 46° (1), Calculated: 46°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v, medium to weak

Chemical Properties of FontarnauiteHide

Formula:
(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2O
IMA Formula:
(Na,K)2(Sr,Ca)(SO4)[B5O8(OH)](H2O)2

Crystallography of FontarnauiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.458(2) Å, b = 22.299(7) Å, c = 8.571(2) Å
β = 103.05(1)°
Ratio:
a:b:c = 0.29 : 1 : 0.384
Unit Cell V:
1,202.41 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.15(100)
3.395(8)
3.339(20)
3.199(30)
3.046(10)
3.025(7)
2.750(10)
2.400(8)

Occurrences of FontarnauiteHide

Paragenetic Mode(s):
•  Evaporite

Type Occurrence of FontarnauiteHide

Place of Conservation of Type Material:
Type material is deposited in the collections of the Royal Ontario Museum,Toronto, Ontario, Canada, accession 1244
Geological Setting of Type Material:
Evaporite basin
Associated Minerals at Type Locality:

Synonyms of FontarnauiteHide

Related Minerals - Nickel-Strunz GroupingHide

6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
6.DA.15TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
6.DA.20HungchaoiteMg(B4O7) · 9H2OTric. 1
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6Orth. mmm (2/m 2/m 2/m) : Pbam
6.DA.25RoweiteCa2Mn2+2B4O7(OH)6Orth.
6.DA.30HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon.
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2Tric.
6.DA.40NumanoiteCa4Cu(B4O6(OH)6)(CO3)2Mon. 2/m : B2/m

Fluorescence of FontarnauiteHide

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 FontarnauiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
J. García-Veigas, L. Rosell, X. Alcobé, I. Subias, F. Ortí, I. Gündogan and C. Helvaci (2010) Fontarnauite, a New Sulphate-Borate Mineral from the Emet Borate District (Turkey). Macla 13, 97-98. [http://www.ehu.es/sem/macla_pdf/macla13/Macla13_097.pdf]
Cooper, M.A., Hawthorne, F.C., Garcıá-Veigas, J., Alcobé, X., Helvaci, C., Grew, E.S. and Ball, N.A. (2014) Fontarnauite, IMA 2009-096a. CNMNC Newsletter No. 22, October 2014, page 1244; Mineralogical Magazine, 78, 1241-1248.
Cooper, M. A., Hawthorne, F. C., García-Veigas, J., Alcobé, X., Helvaci, C., Grew, E. S., & Ball, N. A. (2015). Fontarnauite,(Na, K) 2 (Sr, Ca)(SO4)[B5O8 (OH)](H2O) 2, A New Sulfate-Borate Mineral From Doğanlar (Emet), Kütahya Province, Western Anatolia, Turkey. The Canadian Mineralogist, 53(5), 803-820.

Internet Links for FontarnauiteHide

Localities for FontarnauiteHide

ⓘ - 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.
Turkey (TL)
 
  • Aegean Region
    • Kütahya Province
      • Emet
        • Doğanlar village
J. García-Veigas, L. Rosell, X. Alcobé, I. Subias, F. Ortí, I. Gündogan and C. Helvaci (2010) Fontarnauite, a New Sulphate-Borate Mineral from the Emet Borate District (Turkey). Macla 13, 97-98.; Cooper, M.A., Hawthorne, F.C., Garcıá-Veigas, J., Alcobé, X., Helvaci, C., Grew, E.S. and Ball, N.A. (2014) Fontarnauite, IMA 2009-096a. CNMNC Newsletter No. 22, October 2014, page 1244; Mineralogical Magazine, 78, 1241-1248. ; Cooper, M. A., Hawthorne, F. C., García-Veigas, J., Alcobé, X., Helvaci, C., Grew, E. S., & Ball, N. A. (2015). Fontarnauite,(Na, K) 2 (Sr, Ca)(SO4)[B5O8 (OH)](H2O) 2, A New Sulfate-Borate Mineral From Doğanlar (Emet), Kütahya Province, Western Anatolia, Turkey. The Canadian Mineralogist, 53(5), 803-820.; García-Veigas, J., Rosell, L., Ortí, F., Gündoğan, İ., & Helvacı, C. (2011). Mineralogy, diagenesis and hydrochemical evolution in a probertite–glauberite–halite saline lake (Miocene, Emet Basin, Turkey). Chemical Geology, 280(3-4), 352-364.
Mineral and/or Locality  
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