Fluckite Mineral Data

General Fluckite Information

Chemical Formula:

CaMn(HAsO4)2•2(H2O)

Composition:

Molecular Weight = 410.90 gm

Calcium 9.75 % Ca 13.65 % CaO

Manganese 13.37 % Mn 17.26 % MnO

Arsenic 36.47 % As 55.94 % As₂O₅

Hydrogen 1.47 % H 13.15 % H₂O

Oxygen 38.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺H₂(AsO₄)₂•2(H₂O)

IMA Status:

Approved IMA 1980

Locality:

Gabe Gottes St. Jacques vein at Ste.-Marie-aux-Mines, Vosges Mts., Alsace, France. Link to MinDat.org Location Data.

Name Origin:

Named for Pierre Fluck, Mineralogist at Louis Pasteur University, Strasbourg, France.

Name Pronunciation:

Fluckite

Synonym:

ICSD 200702

PDF -195

Fluckite Image

Images:

Fluckite

Comments: White to pale pink crystalline translucent botryoids of fluckite.
Location: Giftgrube, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Fluckite Crystallography

Axial Ratios:

a:b:c =1.1111:1:0.9152

Cell Dimensions:

a = 8.459, b = 7.613, c = 6.968, Z = 2; alpha = 82.21°, beta = 98.25°, gamma = 95.86° V = 437.69 Den(Calc)= 3.12

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 7.512(1), 3.266(0.91), 3.528(0.9),

Physical Properties of Fluckite

Cleavage:

{010} Perfect, {100} Good, {101} Indistinct

Color:

Colorless, Light pink, Dark pink.

Density:

3.05

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

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

Hardness:

3.5-4 - Copper Penny-Fluorite

Streak:

white

Optical Properties of Fluckite

Gladstone-Dale:

CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2026,KPDmeas= 0.2066,KC= 0.198
Ncalc = 1.6 - 1.62

Optical Data:

Biaxial (?), a=1.618, g=1.642, bire=0.0240, 2V(Meas)=large.

Calculated Properties of Fluckite

Electron Density:

Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Fluckite =3.11 gm/cc.

Fermion Index:

Fermion Index = 0.0003207819
Boson Index = 0.9996792181

Photoelectric:

PE_Fluckite= 29.35 barns/electron
U=PE_Fluckite x rElectron Density= 87.54 barns/cc.

Radioactivity:

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

Fluckite Classification

Dana Class:

39.01.02.01 (39)Hydrated Acid Phosphates, etc

(39.01)A+ [HXO4] � x(H2O)

(39.01.02)Dana Group

39.01.02.01 Fluckite CaMn(HAsO4)2•2(H2O) P1 1

Strunz Class:

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

08.C - Phosphates without Additional Anions, with H2O

08.CB -With only medium-sized cations, RO4:H2O = 1:1

08.CB.15 Fluckite CaMn(HAsO4)2•2(H2O) P1 1

08.CB.15 Krautite MnAsO3(OH)2•(H2O) P 2₁ 2

Other Fluckite Information

References:

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

See Also:

Links to other databases for Fluckite :
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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Print or Cut-and-Paste your Fluckite Specimen Label here :

Fluckite

CaMn(HAsO4)2•2(H2O)
Dana No: 39.01.02.01 Strunz No: 08.CB.15
Locality:

Notes:

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