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Gatehouseite

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Formula:
Mn2+5(PO4)2(OH)4
Colour:
Light reddish orange to light reddish brown to pale yellow
Lustre:
Adamantine
Hardness:
4
Specific Gravity:
3.74 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in 1993 by Alan Pring and William. D. Birch in honor of Dr. Bryan Michael Kenneth Cummings Gatehouse (3 January 1932 - 18 September 2014), crystal chemist who contributed to the understanding of oxides and oxysalts, Monash University, Melbourne, Australia.
Often in rounded crystal aggreagates or in divergent crystal clusters. Isostructural with its arsenate analogue arsenoclasite and aggregates to 5 mm may be overgrown on arsenoclasite. In this association, both gatehouseite and arsenoclasite may have the same color and transparency. Caution is advised in sight identifying gatehouseite as gatehouseite occurs as somewhat bladed crystals. Arsenoclasite without gatehouseite present has been distributed as only gatehouseite.


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Classification of GatehouseiteHide

Approved
Approval Year:
1992
First Published:
1993
8.BD.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
41.4.1.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq

Physical Properties of GatehouseiteHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
Light reddish orange to light reddish brown to pale yellow
Streak:
Pale yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Fracture:
Splintery
Density:
3.74 g/cm3 (Calculated)
Comment:
3.85 for the empirical formula

Optical Data of GatehouseiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.741 nβ = 1.750 nγ = 1.761
Birefringence:
0.020
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v moderate
Optical Extinction:
Parallel, length slow
Pleochroism:
Strong
Comments:
Brown to colorless

Chemical Properties of GatehouseiteHide

Formula:
Mn2+5(PO4)2(OH)4
Common Impurities:
Fe,Cu,Zn,Pb,Al,V,As,H2O

Crystallography of GatehouseiteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Setting:
P21 21 21
Cell Parameters:
a = 9.097 Å, b = 5.693 Å, c = 18.002 Å
Ratio:
a:b:c = 1.598 : 1 : 3.162
Unit Cell V:
932.31 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Isolated crystals are rare, originally less than 100 microns long. Bladed crystals show c {001}. m {110}, and n {102}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.483 (10)
4.034 (10)
2.900 (100)
2.853 (70)
2.802 (50)
2.702 (80)
2.291 (10)
2.265 (10)
2.022 (15)
1.608 (15)

Type Occurrence of GatehouseiteHide

General Appearance of Type Material:
Individual crystals rare and originally found less than 100 microns in length. Reddish-oragnge to reddish brown transparent to translucent intergrown crystals. The most closely associated species are arsenoclasite, baryte, calcite, hausmannite, and hemati
Associated Minerals at Type Locality:

Synonyms of GatehouseiteHide

Other Language Names for GatehouseiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite2 photos of Gatehouseite associated with Calcite on mindat.org.
Hausmannite2 photos of Gatehouseite associated with Hausmannite on mindat.org.
Baryte1 photo of Gatehouseite associated with Baryte on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BD.05CornwalliteCu5(AsO4)2(OH)4Mon. 2/m : P21/b
8.BD.05PseudomalachiteCu5(PO4)2(OH)4Mon. 2/m : P21/b
8.BD.05ReichenbachiteCu5(PO4)2(OH)4Mon. 2/m
8.BD.10ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
8.BD.15ParweliteMn10Sb2As2Si2O24Mon. m : Bb
8.BD.20ReppiaiteMn2+5(VO4)2(OH)4Mon.
8.BD.25LudjibaiteCu5(PO4)2(OH)4Tric. 1 : P1
8.BD.30CornubiteCu5(AsO4)2(OH)4Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

41.4.1.1ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.

Fluorescence of GatehouseiteHide

Not fluorescent in UV

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 GatehouseiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ruszala, F.A., Anderson, J.B., Kostiner, E. (1977) Crystal structures of two isomorphs of arsenoclasite: Co5(PO4)2(OH)4 and Mn5(PO4)2(OH)4. Inorganic Chemistry: 16: 2417-2422.
Pring, A., Birch, W.D. (1993) Gatehouseite, a new manganese hydroxy phosphate, from Iron Monarch, South Australia. Mineralogical Magazine: 57: 309-313.
Jambor, J.L., Grew, E.S. (1994) New mineral names. American Mineralogist: 79: 185-189.
Mandarino, J.A. (1997) New Minerals 1990-1994. The Mineralogical Record Inc.
Elliott, P., Pring, A. (2011) The crystal structure of gatehouseite. Mineralogical Magazine: 75: 2823-2832.

Internet Links for GatehouseiteHide

Localities for GatehouseiteHide

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
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Mineralogical Magazine(1993) 57, 309-313; NM 90-94 (1997); HB4 (2000); Pring A, Birch W D (1993) Gatehouseite, a new manganese hydroxy phosphate from Iron Monarch, South Australia. Mineralogical Magazine 57, 309-313
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Kuruman
        • N'Chwaning Mines
Personally communication between Bruce Cairncross and Frank Hawthorne who quatitatively identified a second, virtually identical specimen of gatehouseite
Mineral and/or Locality  
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