Heidornite Mineral Data

Heidornite Mineral Data +

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General Heidornite Information

Chemical Formula:

Na2Ca3B5O8(SO4)2Cl(OH)2

Composition:

Molecular Weight = 609.85 gm

Sodium 7.54 % Na 10.16 % Na₂O

Calcium 19.72 % Ca 27.59 % CaO

Boron 8.86 % B 28.54 % B₂O₃

Hydrogen 0.33 % H 2.95 % H₂O

Sulfur 10.52 % S 26.26 % SO₃

Chlorine 5.81 % Cl 5.81 % Cl

- % Cl -1.31 % -O=Cl₂

Oxygen 47.22 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₃B₅O₈(SO₄)₂Cl(OH)₂

Environment:

Drill core at 1,968 m associated with glauberite in a cavity in the Upper Anhydrite zone.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Zechstein formation, on the German-Dutch border. Link to MinDat.org Location Data.

Name Origin:

Named for F. Heidorn, German geologist who studied the Zechstein deposits.

Synonym:

ICSD 24458

PDF 25-805

Heidornite Image

Images:

Heidornite

Comments: Colorless crystals of heidornite.
Location: Niedersachswerfen, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Heidornite Crystallography

Axial Ratios:

a:b:c =1.3022:1:2.3966

Cell Dimensions:

a = 10.21, b = 7.84, c = 18.79, Z = 4; beta = 93.33° V = 1,501.53 Den(Calc)= 2.70

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

Crystal Structure:

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Burzlaff H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1967 (1967) p.157-169, Die struktur des heidornit Ca3Na2Cl(SO4)2B5O8(OH)2

Physical Properties of Heidornite

Cleavage:

[001] Perfect

Color:

Colorless.

Density:

2.753

Diaphaniety:

Transparent

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Heidornite

Gladstone-Dale:

CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2186,KPDmeas= 0.2144,KC= 0.2135

Optical Data:

Biaxial (+), a=1.579, b=1.588, g=1.604, bire=0.0250, 2V(Calc)=76, 2V(Meas)=63-77.

Calculated Properties of Heidornite

Electron Density:

r_electron=2.73 gm/cc
note: r_Heidornite=2.75 gm/cc.

Fermion Index

Fermion Index = 0.01891
Boson Index = 0.98109

Photoelectric:

PE_Heidornite= 3.67 barns/electron
U=PE_Heidornite x r_electron= 10.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Heidornite is Not Radioactive

Heidornite Classification

Dana Class:

32.3.5.1 (32)Compound Sulfates

(32.3)(anhydrous) with poly-anionic formula

(32.3.5)Dana Group

32.3.5.1 Heidornite Na2Ca3B5O8(SO4)2Cl(OH)2 C 2/c 2/m

Strunz Class:

V/K.04-40 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.04 - Hilgardite-1Tc - Heidornite series

V/K.04-10 Hilgardite Ca2B5O9Cl·(H2O) P1 1

V/K.04-30 Tyretskite Ca2B5O9(OH)·(H2O) P1 1

V/K.04-40 Heidornite Na2Ca3B5O8(SO4)2Cl(OH)2 C 2/c 2/m

Other Heidornite Information

References:

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

See Also:

Links to other databases for Heidornite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Translate Heidornite Mineral Data :

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

Heidornite

Na2Ca3B5O8(SO4)2Cl(OH)2
Dana No: 32.3.5.1 Strunz No: V/K.04-40
Locality:

Notes: