Matulaite Mineral Data

Matulaite Mineral Data +

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General Matulaite Information

Chemical Formula:

CaAl18(PO4)12(OH)20·28(H2O)

Composition:

Molecular Weight = 2,509.98 gm

Calcium 1.60 % Ca 2.23 % CaO

Aluminum 19.35 % Al 36.56 % Al₂O₃

Phosphorus 14.81 % P 33.93 % P₂O₅

Hydrogen 3.05 % H 27.27 % H₂O

Oxygen 61.19 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₁₈(PO₄)₁₂(OH)₂₀·28(H₂O)

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Matulaite Image

Images:

Matulaite

Comments: Opaque white pearly crystalline matulaite coating on quartz and brown limonite.
Location: Bachman Iron Mine, Hellertown, Northampton County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Matulaite Crystallography

Axial Ratios:

a:b:c =1.2215:1:0.6347

Cell Dimensions:

a = 20.4, b = 16.7, c = 10.6, Z = 2; beta = 98.2° V = 3,574.29 Den(Calc)= 2.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 9.96(1), 4.42(0.4), 6.37(0.4),

Physical Properties of Matulaite

Cleavage:

[100] Perfect

Color:

Colorless, White.

Density:

2.33

Diaphaniety:

Transparent to Translucent

Hardness:

1 - Talc

Luster:

Pearly

Streak:

white

Optical Properties of Matulaite

Gladstone-Dale:

CI meas= -0.057 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2485,KPDmeas= 0.2485,KC= 0.2352

Optical Data:

Biaxial (-), b=1.576, g=1.582, , 2V(Meas)=60.

Calculated Properties of Matulaite

Electron Density:

r_electron=2.37 gm/cc
note: r_Matulaite=2.33 gm/cc.

Fermion Index

Fermion Index = 0.00031
Boson Index = 0.99969

Photoelectric:

PE_Matulaite= 1.53 barns/electron
U=PE_Matulaite x r_electron= 3.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Matulaite is Not Radioactive

Matulaite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.3)Dana Group

42.13.3.1 Matulaite CaAl18(PO4)12(OH)20·28(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.50-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.50 - Matulaite - Morinite series

VII/D.50-10 Matulaite CaAl18(PO4)12(OH)20·28(H2O) P 2₁/c 2/m

VII/D.50-20 Foggite CaAl(PO4)(OH)2·(H2O) A2122 2 2 2

VII/D.50-25 Krasnovite! Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O) Pnna,Pnnn 2/m 2/m 2/m

VII/D.50-30 Morinite NaCa2Al2(PO4)2(F,OH)5·2(H2O) P 2₁/m 2/m

Other Matulaite 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 Matulaite :
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 -École des Mines de Paris

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Matulaite

CaAl18(PO4)12(OH)20·28(H2O)
Dana No: 42.13.3.1 Strunz No: VII/D.50-10
Locality:

Notes: