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Hylbrownite

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Henry Yorke Lyell Brown
Formula:
Na3Mg(P3O10) · 12H2O
Colour:
Colourless to white
Lustre:
Vitreous
Specific Gravity:
1.81
Crystal System:
Monoclinic
Name:
after Henry Yorke Lyell Brown (23 August 1843 – 22 January 1928), Government Geologist of South Australia (1882 to 1912), to honor his first observations of the interior of the South Australia and Northern Territory states; this has given rise to the first geological map of the whole colony in 1899
The Mg analogue of kanonerovite. Second natural (mineral) triphosphate. Chemically related to apexite, bakhchisaraitsevite, and mejillonesite.

The structure is based on (1) [Mg(H2O)3P3O10] clusters, sharing face and corners with Na polyhedra in the b direction, and (2) hexa- and heptacoordinated Na polyhedra that form Na2O9 dimers, corner sharing to give chains along b. The (1) and (2) elements are connected in the c direction to give thick sheets || (100); hydrogen bonds link the sheets in the a direction.


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Classification of HylbrowniteHide

Approved
Approval Year:
2010
8.F0.

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
0 :

Physical Properties of HylbrowniteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to white
Streak:
white
Comment:
not determined
Tenacity:
Brittle
Cleavage:
Distinct/Good
parallel to {001} and to {100}
Fracture:
Irregular/Uneven
Density:
1.81(4) g/cm3 (Measured)    1.82 g/cm3 (Calculated)

Optical Data of HylbrowniteHide

Type:
Biaxial (-)
RI values:
nα = 1.390(4) nβ = 1.421(4) nγ = 1.446(4)
2V:
Calculated: 82.2°
Max Birefringence:
δ = 0.056
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 HylbrowniteHide

Formula:
Na3Mg(P3O10) · 12H2O
IMA Formula:
Na3MgP3O10 · 12H2O
Common Impurities:
Ca

Crystallography of HylbrowniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 14.722(3) Å, b = 9.240(2) Å, c = 15.052(3) Å
β = 90.01(3)°
Ratio:
a:b:c = 1.593 : 1 : 1.629
Unit Cell V:
2047.5 ų
Z:
4
Morphology:
thin prismatic to acicular
Comment:
Space group P21/n.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.530 (60)
7.357 (80)
6.949 (100)
5.835 (30)
4.754 (35)
3.934 (40)
3.510 (45)
3.336 (35)

Type Occurrence of HylbrowniteHide

General Appearance of Type Material:
thin prismatic to acicular in habit and are elongate along [001], in aggregates and sprays; the crystals are up to 0.12 x 0.02 mm; forms observed: {010}, {100}, {001}, {210}, {201}
Geological Setting of Type Material:
within a seam; formed after the arsenate assemblage, within hypergene ore-bodies related likely to granite intrusion within metasediments
Associated Minerals at Type Locality:

Synonyms of HylbrowniteHide

Fluorescence of HylbrowniteHide

Other InformationHide

IR Spectrum:
[cm-1]: 3287 (OH stretching), 1670 + 1643 (H-O-H bending of water), 1254 + 1118 + 1022 + 995 + 906 (asymmetric streching of PO3 groups), 906 + 742 (O-P-O stretching), 692 + 658 (O-P-O bending)
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 HylbrowniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Elliott, P., Brugger, J. and Caradoc-Davies, T. (2010) Hylbrownite, IMA 2010-054. CNMNC Newsletter No. 7, February 2010, page 29; Mineralogical Magazine: 75: 27-31.
Elliott, P., Brugger, J. and Caradoc-Davies, T. (2013): Hylbrownite, Na3MgP3O10·12H2O, a new triphosphate mineral from the Dome Rock Mine, South Australia: description and crystal structure. Mineralogical Magazine: 77: 385-398.

Internet Links for HylbrowniteHide

Localities for HylbrowniteHide

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.
Australia (TL)
 
  • South Australia
    • Olary Province
      • Boolcoomatta Reserve (Boolcoomata Station; Boolcoomatta)
Elliott, P., Brugger, J. and Caradoc-Davies, T. (2010) Hylbrownite, IMA 2010-054. CNMNC Newsletter No. 7, February 2010, page 29; Mineralogical Magazine, 75, 27-31; Elliott, P., Brugger, J. and Caradoc-Davies, T. (2013): Hylbrownite, Na3MgP3O10·12H2O, a new triphosphate mineral from the Dome Rock Mine, South Australia: description and crystal structure. Mineralogical Magazine 77, 385-398.
Italy
 
  • Tuscany
    • Florence Province
      • Impruneta
Batacchi, C., Capperi, M., Cosci, C., Bittarello, E., Ciriotti, M.E., Prosperi, B., Borselli, G., Fassina, B., Ceccantini, L. (2015): Secondo ritrovamento mondiale di hylbrownite e altre nuove identificazioni nelle serpentiniti di Impruneta, Toscana. Micro, 1/2015, 40-51
Mineral and/or Locality  
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