Pharmacolite Mineral Data

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."

Name Pronunciation:

Pharmacolite

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:

Haidingerite Pharmacolite

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 - Domatic H-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),

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Forms: ( 0 1 0) ( 1 3 2) ( 1 1 2) ( 0 1 1) ( 1 1 0)

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Physical Properties of Pharmacolite

Cleavage:

{010} Perfect

Color:

White, Yellow, Reddish white, Grayish white.

Density:

2.6 - 2.73, Average = 2.66

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.55 - 1.58

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:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Pharmacolite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.0004672354
Boson Index = 0.9995327646

Photoelectric:

PE_Pharmacolite= 25.27 barns/electron
U=PE_Pharmacolite x rElectron Density= 67.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pharmacolite is Not Radioactive

Pharmacolite Classification

Dana Class:

39.01.01.02 (39)Hydrated Acid Phosphates, etc

(39.01)A+ [HXO4] ï¿½ x(H2O)

(39.01.01)Dana Group

39.01.01.01 Brushite CaHPO4•2(H2O) I2/a 2/m

39.01.01.02 Pharmacolite CaHAsO4•2(H2O) Ia m

Strunz Class:

08.CJ.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.50 Ardealite Ca2(SO4)(HPO4)•4(H2O) Cc m

08.CJ.50 Brushite CaHPO4•2(H2O) I2/a 2/m

08.CJ.50 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono

08.CJ.50 Churchite-(Nd)! Nd(PO4)•2(H2O) Mono

08.CJ.50 Churchite-(Y) YPO4•2(H2O) A2/a,Aa Mono

08.CJ.50 Pharmacolite CaHAsO4•2(H2O) Ia m

Other Pharmacolite Information

References:

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

See Also:

Links to other databases for Pharmacolite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Pharmacolite

CaHAsO4•2(H2O)
Dana No: 39.01.01.02 Strunz No: 08.CJ.50
Locality:

Notes:

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