Picropharmacolite Mineral Data

Picropharmacolite Mineral Data +

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General Picropharmacolite Information

Chemical Formula:

Ca4Mg(AsO3OH)2(AsO4)2·11(H2O)

Composition:

Molecular Weight = 940.48 gm

Calcium 17.05 % Ca 23.85 % CaO

Magnesium 2.58 % Mg 4.29 % MgO

Arsenic 31.87 % As 48.88 % As₂O₅

Hydrogen 2.57 % H 22.99 % H₂O

Oxygen 45.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Mg(AsO₃OH)₂(AsO₄)₂·11(H₂O)

Environment:

Secondary mineral formed in the oxidation zone of arsenic ore deposits.

IMA Status:

Valid Species (Pre-IMA) 1819

Locality:

Riechelsdorf, Hessen, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for its magnesia content and the similarity to pharmacolite.

Synonym:

ICSD 100730

PDF 14-222

Picropharmacolite Image

Images:

Picropharmacolite

Comments: White, acicular crystalline sprays of picropharmacolite on matrix.
Location: Wechsel Schacht, Richelsdorf, Hesse, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Picropharmacolite

Comments: Snow white acicular, radial spray of picropharmacolite with pink sainfeldite.
Location: Wilhelm Mine, Richelsdorf District, Hesse, Germany. Scale: Cluster size 6 mm.
© Tom Loomis / Dakota Matrix

Picropharmacolite Crystallography

Axial Ratios:

a:b:c =1.0034:1:0.497

Cell Dimensions:

a = 13.547, b = 13.5, c = 6.71, Z = 2; alpha = 99.85°, beta = 96.41°, gamma = 91.6° V = 1,201.04 Den(Calc)= 2.60

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 13.5(1), 3.18(0.8), 9.2(0.6),

Crystal Structure:

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Catti M , Ferraris G , Ivaldi G , American Mineralogist , 66 (1981) p.385-391, The crystal structure of picropharmacolite, Ca4Mg(HAsO4)2(AsO4)2*11H2O

Physical Properties of Picropharmacolite

Cleavage:

[100] Perfect, [010] Perfect

Color:

Colorless, Silky white.

Density:

2.58

Diaphaniety:

Transparent to Translucent

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Hardness:

1-2 - Between Talc and Gypsum

Luminescence:

Non-fluorescent.

Luster:

Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Picropharmacolite

Gladstone-Dale:

CI meas= -0.138 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.13 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.244,KPDmeas= 0.2459,KC= 0.216

Optical Data:

Biaxial (?), a=1.631, b=1.632, g=1.64, bire=0.0090, 2V(Calc)=40, 2V(Meas)=40. Dispersion r < v strong.

Calculated Properties of Picropharmacolite

Electron Density:

r_electron=2.57 gm/cc
note: r_{Picropharmacolite}=2.60 gm/cc.

Fermion Index

Fermion Index = 0.00303
Boson Index = 0.99697

Photoelectric:

PE_{Picropharmacolite}= 23.17 barns/electron
U=PE_{Picropharmacolite} x r_electron= 59.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Picropharmacolite is Not Radioactive

Picropharmacolite Classification

Dana Class:

39.2.4.1 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.4)Dana Group

39.2.4.1 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2·11(H2O) P1 1

Strunz Class:

VII/C.24-90 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.24 - Haidingerite - Picropharmacolite series

VII/C.24-10 Haidingerite Ca(AsO3OH)·(H2O) Pcnb 2/m 2/m 2/m

VII/C.24-20 Mcnearite NaCa5H4(AsO4)5·4(H2O) P1,P 1 Tri

VII/C.24-30 Irhtemite Ca4Mg(AsO3OH)2(AsO4)2·4(H2O) Unk Mono

VII/C.24-40 Vladimirite Ca5(AsO3OH)2(AsO4)2·5(H2O) P 2₁/c 2/m

VII/C.24-50 Ferrarisite Ca5(AsO3OH)2(AsO4)2·9(H2O) P1 1

VII/C.24-60 Guerinite Ca5(AsO3OH)2(AsO4)2·9(H2O) P 2₁/n 2/m

VII/C.24-70 Rauenthalite Ca3(AsO4)2·10(H2O) P1 1

VII/C.24-80 Phaunouxite Ca3(AsO4)·11(H2O) P1 1

VII/C.24-90 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2·11(H2O) P1 1

Other Picropharmacolite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Picropharmacolite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Picropharmacolite

Ca4Mg(AsO3OH)2(AsO4)2·11(H2O)
Dana No: 39.2.4.1 Strunz No: VII/C.24-90
Locality:

Notes: