Heidornite Mineral Data

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.

Name Pronunciation:

Heidornite + Pronunciation

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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c

Physical Properties of Heidornite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

2.753

Diaphaneity:

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
Ncalc = 1.58 - 1.59

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:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Heidornite =2.75 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Heidornite= 3.67 barns/electron
U=PE_Heidornite x rElectron Density= 10.01 barns/cc.

Radioactivity:

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

Heidornite Classification

Dana Class:

32.03.05.01 (32)Compound Sulfates

(32.03)(anhydrous) with poly-anionic formula

(32.03.05)Dana Group

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

Strunz Class:

06.EC.30 06 - BORATES

06.E - Pentaborates

06.EC -Phyllo-pentaborates

06.EC.30 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Heidornite

Na2Ca3B5O8(SO4)2Cl(OH)2
Dana No: 32.03.05.01 Strunz No: 06.EC.30
Locality:

Notes:

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