Gatehouseite Mineral Data

Gatehouseite Mineral Data +

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General Gatehouseite Information

Chemical Formula:

Mn++5(PO4)2(OH)4

Composition:

Molecular Weight = 532.66 gm

Manganese 51.57 % Mn 66.59 % MnO

Phosphorus 11.63 % P 26.65 % P₂O₅

Hydrogen 0.76 % H 6.76 % H₂O

Oxygen 36.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅(PO₄)₂(OH)₄

IMA Status:

Approved IMA 1993

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 1198

IMA1992-016

PDF 47-1822

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Gatehouseite Crystallography

Axial Ratios:

a:b:c =1.5979:1:3.1621

Cell Dimensions:

a = 9.097, b = 5.693, c = 18.002, Z = 4; V = 932.31 Den(Calc)= 3.79

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.9(1), 2.702(0.8), 2.853(0.7),

Crystal Structure:

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Ruszala F A , Anderson J B , Kostiner E , Inorganic Chemistry , 16 (1977) p.2417-2422, Crystal structures of two isomorphs of arsenoclasite:, Co5(PO4)2(OH)4 and Mn5(PO4)2(OH)4, Locality: synthetic

Physical Properties of Gatehouseite

Cleavage:

[???] Good

Color:

Yellow, Yellow, Pale orange.

Density:

3.74

Diaphaniety:

Transparent

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

light yellow

Optical Properties of Gatehouseite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1979,KPDmeas= 0.2005,KC= 0.2029

Optical Data:

Biaxial (+/-), a=1.74, b=1.75, g=1.76, bire=0.0200

Calculated Properties of Gatehouseite

Electron Density:

r_electron=3.58 gm/cc
note: r_Gatehouseite=3.74 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_Gatehouseite= 13.88 barns/electron
U=PE_Gatehouseite x r_electron= 49.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gatehouseite is Not Radioactive

Gatehouseite Classification

Dana Class:

41.4.1.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.4)where (A B)5 (XO4)2 Zq

(41.4.1)Dana Group

41.4.1.1 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

41.4.1.2 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.11-65 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.11 - Pseudomalachite group, Ludjibaite - Reppiaite series

VII/B.11-10 Ludjibaite Cu5(PO4)2(OH)4 P1 1

VII/B.11-20 Pseudomalachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-30 Reichenbachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-40 Cornwallite Cu5(AsO4)2(OH)4 P 2₁/a 2/m

VII/B.11-50 Cornubite Cu5(AsO4)2(OH)4 P1 1

VII/B.11-60 Turanite Cu5(VO4)2(OH)4 P1 1

VII/B.11-65 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-70 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-80 Reppiaite Mn5[(V,As)O4]2(OH)4 C 2/m 2/m

Other Gatehouseite Information

References:

PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

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Gatehouseite

Mn++5(PO4)2(OH)4
Dana No: 41.4.1.2 Strunz No: VII/B.11-65
Locality:

Notes: