Hungchaoite Mineral Data

Hungchaoite Mineral Data +

General Hungchaoite Information

Chemical Formula:

MgB4O5(OH)4·7(H2O)

Composition:

Molecular Weight = 341.68 gm

Magnesium 7.11 % Mg 11.80 % MgO

Boron 12.66 % B 40.75 % B₂O₃

Hydrogen 5.31 % H 47.45 % H₂O

Oxygen 74.92 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgB₄O₅(OH)₄·7(H₂O)

IMA Status:

Approved IMA 1964

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 10423

PDF 34-1288

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Hungchaoite Crystallography

Axial Ratios:

a:b:c =0.8277:1:0.741

Cell Dimensions:

a = 8.811, b = 10.644, c = 7.888, Z = 2; alpha = 103.38°, beta = 108.58°, gamma = 97.15° V = 676.88 Den(Calc)= 1.68

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 6.71(1), 3.356(0.92), 5.36(0.85),

Crystal Structure:

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Wan C , Ghose S , American Mineralogist , 62 (1977) p.1135-1143, Hungchaoite, Mg(H2O)5B4O5(OH)4.2H2O: a hydrogen-bonded molecular complex

Physical Properties of Hungchaoite

Cleavage:

[111] Good, [111] Good

Color:

Colorless, White.

Density:

1.706

Diaphaniety:

Transparent to Translucent

Hardness:

2.5 - Finger Nail

Streak:

white

Optical Properties of Hungchaoite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2817,KPDmeas= 0.2775,KC= 0.2725

Optical Data:

Biaxial (-), a=1.445, b=1.485, g=1.49, bire=0.0450, 2V(Calc)=38, 2V(Meas)=15.

Calculated Properties of Hungchaoite

Electron Density:

r_electron=1.78 gm/cc
note: r_Hungchaoite=1.71 gm/cc.

Fermion Index

Fermion Index = 0.03266
Boson Index = 0.96734

Photoelectric:

PE_Hungchaoite= 0.46 barns/electron
U=PE_Hungchaoite x r_electron= 0.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hungchaoite is Not Radioactive

Hungchaoite Classification

Dana Class:

26.4.3.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.4)Dana Type

(26.4.3)Dana Group

26.4.3.1 Hungchaoite MgB4O5(OH)4·7(H2O) P1 1

Strunz Class:

V/H.12-20 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.12 - Halurgite - Eketerinite series

V/H.12-10 Halurgite Mg2[B4O5(OH)4]2·(H2O) P 2/c 2/m

V/H.12-20 Hungchaoite MgB4O5(OH)4·7(H2O) P1 1

V/H.12-30 Wardsmithite Ca5MgB24O42·30(H2O) Unk Hex

V/H.12-40 Ekaterinite Ca2B4O7(Cl,OH)2·2(H2O) C6 6

Other Hungchaoite 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 Hungchaoite :
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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Print or Cut-and-Paste your Hungchaoite Specimen Label here :

Hungchaoite

MgB4O5(OH)4·7(H2O)
Dana No: 26.4.3.1 Strunz No: V/H.12-20
Locality:

Notes: