Kremersite Mineral Data

Kremersite Mineral Data +

General Kremersite Information

Chemical Formula:

(NH4,K)2Fe+++Cl5·(H2O)

Composition:

Molecular Weight = 297.73 gm

Potassium 6.57 % K 7.91 % K₂O

Iron 18.76 % Fe 26.82 % Fe₂O₃

Hydrogen 2.03 % H - % Calc as (NH₄)₂O

Hydrogen 0.68 % H 6.05 % H₂O

Nitrogen 7.06 % N 13.12 % (NH₄)₂O

Chlorine 59.54 % Cl 59.54 % Cl

- % Cl -13.43 % -O=Cl₂

Oxygen 5.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)_1.5K_0.5Fe³⁺Cl₅·(H₂O)

Environment:

Acidic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1853

Locality:

Vesuvius, Italy and Mt. Etna, Sicily, Link to MinDat.org Location Data.

Name Origin:

Named for Peter Kremers (1827-?), German chemist.

Synonym:

ICSD 200322

PDF 28-734

Kremersite Image

Images:

Kremersite

Comments: Orange crystals of kremersite.
Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Kremersite Crystallography

Axial Ratios:

a:b:c =0.7178:1:0.5146

Cell Dimensions:

a = 9.803, b = 13.657, c = 7.028, Z = 4; V = 940.91 Den(Calc)= 2.10

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

Physical Properties of Kremersite

Cleavage:

[210] Perfect, [011] Perfect

Color:

Brown red, Red, Orange.

Density:

2.17

Diaphaniety:

Transparent to Translucent

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Habit:

Water Soluble - Water soluble mineral.

Luster:

Vitreous (Glassy)

Optical Properties of Kremersite

Gladstone-Dale:

CI meas= -0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.165 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3595,KPDmeas= 0.3479,KC= 0.3087

Optical Data:

Biaxial (+), a=1.715, b=1.75, g=1.8, bire=0.0850, 2V(Calc)=82, 2V(Meas)=62.

Calculated Properties of Kremersite

Electron Density:

r_electron=2.14 gm/cc
note: r_Kremersite=2.17 gm/cc.

Fermion Index

Fermion Index = 0.07432
Boson Index = 0.92568

Photoelectric:

PE_Kremersite= 10.07 barns/electron
U=PE_Kremersite x r_electron= 21.58 barns/cc.

Radioactivity:

GRapi = 93.53 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kremersite - barely detectable

Kremersite Classification

Dana Class:

11.4.1.2 (11)Halide Complexes; Alumino-fluorides

(11.4)where (A)m B (X)5 · x(H2O)

(11.4.1)Dana Group

11.4.1.1 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m

11.4.1.2 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

III/C.07-40 III - Halogenides

III/C - Double halogenides with water, Chlorides

III/C.07 - Rinneite - Kremersite series

III/C.07-10 Mitscherlichite K2CuCl4·2(H2O) P 4₁/mnm 4/m 2/m 2/m

III/C.07-20 Douglasite K2FeCl4·2(H2O) Unk. Mono

III/C.07-30 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m

III/C.07-40 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m

Other Kremersite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Kremersite

(NH4,K)2Fe+++Cl5·(H2O)
Dana No: 11.4.1.2 Strunz No: III/C.07-40
Locality:

Notes: