Pharmacolite Mineral Data

Pharmacolite Mineral Data +

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General Pharmacolite Information

Chemical Formula:

CaHAsO4·2(H2O)

Composition:

Molecular Weight = 216.04 gm

Calcium 18.55 % Ca 25.96 % CaO

Arsenic 34.68 % As 53.19 % As₂O₅

Hydrogen 2.33 % H 20.85 % H₂O

Oxygen 44.44 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaH(AsO₄)·2(H₂O)

Environment:

Secondary mineral which forms in the presence of arsenide-bearing minerals.

IMA Status:

Valid Species (Pre-IMA) 1800

Locality:

Wittichen, Schwarzwald, Germany Link to MinDat.org Location Data.

Name Origin:

From the Greek, farmakon, "poison" and lithos, "stone."

Synonym:

ICSD 16246

PDF 25-138

Pharmacolite Image

Images:

Pharmacolite

Comments: Pink, fuzzy ball of pharmacolite crystals on matrix.
Location: Schneeberg, Saxony, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Pharmacolite Haidingerite

Comments: Translucent colorless crystalline spherical aggregate of haidingerite with white pharmacolite.
Location: Jachymov, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pharmacolite Crystallography

Axial Ratios:

a:b:c =0.3891:1:0.4151

Cell Dimensions:

a = 5.959, b = 15.313, c = 6.357, Z = 4; beta = 114.67° V = 527.13 Den(Calc)= 2.72

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Ia

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

By Intensity(I/I_o): 3.09(1), 4.32(1), 2.71(0.9),

Forms:

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Forms: [ 0 1 0] [ 1 3 2] [ 1 1 2] [ 0 1 1] [ 1 1 0]

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Crystal Structure:

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Ferraris G , Jones D W , Yerkess J , Acta Crystallographica, Section B , 27 (1971) p.349-354, Determination of hydrogen atom positions in the crystal structure of, pharmacolite, CaHAsO4(H2O)2, by neutron diffraction, Locality: Andreasberg, Harz Mts, Lower Saxony, Germany

Physical Properties of Pharmacolite

Cleavage:

[010] Perfect

Color:

White, Yellow, Reddish white, Grayish white.

Density:

2.6 - 2.73, Average = 2.66

Diaphaniety:

Translucent to opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Pharmacolite

Gladstone-Dale:

CI meas= -0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2164,KPDmeas= 0.2209,KC= 0.2116

Optical Data:

Biaxial (-), a=1.583, b=1.589, g=1.594, bire=0.0110, 2V(Calc)=84, 2V(Meas)=77. Dispersion none.

Calculated Properties of Pharmacolite

Electron Density:

r_electron=2.67 gm/cc
note: r_Pharmacolite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.00046
Boson Index = 0.99954

Photoelectric:

PE_Pharmacolite= 25.27 barns/electron
U=PE_Pharmacolite x r_electron= 67.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pharmacolite is Not Radioactive

Pharmacolite Classification

Dana Class:

39.1.1.2 (39)Hydrated Acid Phosphates, etc

(39.1)A+ [HXO4] · x(H2O)

(39.1.1)Dana Group

39.1.1.1 Brushite CaHPO4·2(H2O) I2/a 2/m

39.1.1.2 Pharmacolite CaHAsO4·2(H2O) Ia m

Strunz Class:

VII/C.25-20 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.25 - Brushite - Churchite-(Dy) series

VII/C.25-10 Brushite CaHPO4·2(H2O) I2/a 2/m

VII/C.25-20 Pharmacolite CaHAsO4·2(H2O) Ia m

VII/C.25-30 Churchite-(Y) YPO4·2(H2O) A2/a,Aa Mono

VII/C.25-40 Churchite-(Nd)! Nd(PO4)·2(H2O) Mono

VII/C.25-50 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)·2(H2O) Mono

Other Pharmacolite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Pharmacolite

CaHAsO4·2(H2O)
Dana No: 39.1.1.2 Strunz No: VII/C.25-20
Locality:

Notes: