Spencerite Mineral Data

Spencerite Mineral Data +

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General Spencerite Information

Chemical Formula:

Zn4(PO4)2(OH)2·3(H2O)

Composition:

Molecular Weight = 539.56 gm

Zinc 48.48 % Zn 60.34 % ZnO

Phosphorus 11.48 % P 26.31 % P₂O₅

Hydrogen 1.49 % H 13.36 % H₂O

Oxygen 38.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₄(PO₄)₂(OH)₂·3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1916

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 9349

PDF 35-631

Spencerite Image

Images:

Spencerite

Comments: Pale green pearly translucent spencerite, with divergent structure.
Location: Salmo, Nelson Mining District, British Columbia, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Spencerite Crystallography

Axial Ratios:

a:b:c =1.9774:1:2.1204

Cell Dimensions:

a = 10.441, b = 5.28, c = 11.196, Z = 2; beta = 116.833° V = 550.76 Den(Calc)= 3.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c

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

By Intensity(I/I_o): 9.4(1), 3.501(0.55), 2.332(0.3),

Crystal Structure:

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Fanfani L , Nunzi A , Zanazzi P F , Mineralogical Magazine , 38 (1972) p.687-692, Structure and twinning in spencerite, Locality: Salmo, British Columbia, Canada

Physical Properties of Spencerite

Cleavage:

[???] Perfect, [???] Imperfect

Color:

White.

Density:

3.12

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Spencerite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.184,KPDmeas= 0.1917,KC= 0.1889

Optical Data:

Biaxial (-), a=1.586, b=1.602, g=1.606, bire=0.0200

Calculated Properties of Spencerite

Electron Density:

r_electron=3.03 gm/cc
note: r_Spencerite=3.12 gm/cc.

Fermion Index

Fermion Index = 0.02006
Boson Index = 0.97994

Photoelectric:

PE_Spencerite= 24.46 barns/electron
U=PE_Spencerite x r_electron= 74.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Spencerite is Not Radioactive

Spencerite Classification

Dana Class:

42.6.4.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.4)Dana Group

42.6.4.1 Legrandite Zn2(AsO4)(OH)·(H2O) P 2₁/c 2/m

42.6.4.2 Spencerite Zn4(PO4)2(OH)2·3(H2O) P 2/c 2/m

Strunz Class:

VII/D.07-60 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.07 - Nissonite - Euchroite - Spencerite series

VII/D.07-10 Nissonite Cu2Mg2(PO4)2(OH)2·5(H2O) C 2/c 2/m

VII/D.07-20 Strashimirite Cu8(AsO4)4(OH)4·5(H2O) P 2/m,P 2,Pm Mono

VII/D.07-30 Euchroite Cu2(AsO4)(OH)·3(H2O) P 2₁2₁2₁ 2 2 2

VII/D.07-40 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

VII/D.07-50 Legrandite Zn2(AsO4)(OH)·(H2O) P 2₁/c 2/m

VII/D.07-60 Spencerite Zn4(PO4)2(OH)2·3(H2O) P 2/c 2/m

VII/D.07-70 Nevadaite! (Cu,[],Al,V)6[Al8(PO4)8F8](H2O)23 P 2₁mn 2 2 2

Other Spencerite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Spencerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Spencerite Specimen Label here :

Spencerite

Zn4(PO4)2(OH)2·3(H2O)
Dana No: 42.6.4.2 Strunz No: VII/D.07-60
Locality:

Notes: