Picropharmacolite Mineral Data

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.

Name Pronunciation:

Picropharmacolite + Pronunciation

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 - Pinacoidal H-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),

Physical Properties of Picropharmacolite

Cleavage:

{100} Perfect, {010} Perfect

Color:

Colorless, Silky white.

Density:

2.58

Diaphaneity:

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:

Fluorescent, Short UV=blue-white, violet-white white, Long UV=Blue-white, violet-white white.

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
Ncalc = 1.56

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:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Picropharmacolite =2.60 gm/cc.

Fermion Index:

Fermion Index = 0.0030387768
Boson Index = 0.9969612232

Photoelectric:

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

Radioactivity:

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

Picropharmacolite Classification

Dana Class:

39.02.04.01 (39)Hydrated Acid Phosphates, etc

(39.02)H2 (AB)5 (XO4)4 ï¿½ x(H2O)

(39.02.04)Dana Group

39.02.04.01 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2•11(H2O) P1 1

Strunz Class:

08.CH.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CH -With large and medium-sized cations, RO4:H2O < 1:1

08.CH.15 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2•11(H2O) P1 1

Other Picropharmacolite Information

References:

NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Dana8)

See Also:

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

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Picropharmacolite

Ca4Mg(AsO3OH)2(AsO4)2•11(H2O)
Dana No: 39.02.04.01 Strunz No: 08.CH.15
Locality:

Notes:

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