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)

Environment:

Lacustrine saline borate deposits

IMA Status:

Approved IMA 1964

Locality:

Unspecified locality in China [the Qinghai-Xizang Plateau, Tibet]. Link to MinDat.org Location Data.

Name Origin:

Named for Chang Hung-chao (1877-1951), Chinese geologist and mineralogist.

Name Pronunciation:

Hungchaoite + Pronunciation

Synonym:

ICSD 10423

PDF 34-1288

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 - Pinacoidal H-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),

Physical Properties of Hungchaoite

Cleavage:

{111} Good, {111} Good

Color:

Colorless, White.

Density:

1.706

Diaphaneity:

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= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2784,KPDmeas= 0.2775,KC= 0.2725
Ncalc = 1.46

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:

Bulk Density (Electron Density)=1.78 gm/cc
note: Specific Gravity of Hungchaoite =1.71 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Hungchaoite= 0.46 barns/electron
U=PE_Hungchaoite x rElectron Density= 0.82 barns/cc.

Radioactivity:

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

Hungchaoite Classification

Dana Class:

26.04.03.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.04)Dana Type

(26.04.03)Dana Group

26.04.03.01 Hungchaoite MgB4O5(OH)4•7(H2O) P1 1

Strunz Class:

06.DA.20 06 - BORATES

06.D - Tetraborates

06.DA -Neso-tetraborates

06.DA.20 Hungchaoite MgB4O5(OH)4•7(H2O) P1 1

Other Hungchaoite Information

References:

NAME( AntBidBlaNic5) 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 - 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

Search for Hungchaoite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Hungchaoite :

Ask about Hungchaoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Hungchaoite

MgB4O5(OH)4•7(H2O)
Dana No: 26.04.03.01 Strunz No: 06.DA.20
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.