Hydrochlorborite Mineral Data

General Hydrochlorborite Information

Chemical Formula:

Ca2B4O4(OH)7Cl•7(H2O)

Composition:

Molecular Weight = 468.00 gm

Calcium 17.13 % Ca 23.96 % CaO

Boron 9.24 % B 29.75 % B₂O₃

Hydrogen 4.52 % H 40.42 % H₂O

Chlorine 7.58 % Cl 7.58 % Cl

- % Cl -1.71 % -O=Cl₂

Oxygen 61.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂B₄O₄(OH)₇Cl•7(H₂O)

Environment:

Dry-season evaporite mineral in playa sediments.

IMA Status:

Approved IMA 1965

Locality:

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

Name Origin:

Named for the essential chemical components, water, chlorine and borate.

Name Pronunciation:

Hydrochlorborite + Pronunciation

Synonym:

ICSD 100662

PDF 29-312

Hydrochlorborite Image

Images:

Hydrochlorborite

Comments: White botryoidal crust of hydrochlorborite on massive white anhydrite.
Location: Takuko, Tibet. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrochlorborite Crystallography

Axial Ratios:

a:b:c =2.6052:1:1.9515

Cell Dimensions:

a = 22.783, b = 8.745, c = 17.066, Z = 8; beta = 96.705° V = 3,376.93 Den(Calc)= 1.84

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 8.474(1), 6.005(0.24), 3.605(0.09),

Physical Properties of Hydrochlorborite

Cleavage:

{???} Perfect, {001} Good

Color:

Colorless.

Density:

1.852

Diaphaneity:

Transparent to Translucent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hydrochlorborite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2757,KPDmeas= 0.2739,KC= 0.2757
Ncalc = 1.51

Optical Data:

Biaxial (+), a=1.499, b=1.502, g=1.521, bire=0.0220, 2V(Calc)=44, 2V(Meas)=45.

Calculated Properties of Hydrochlorborite

Electron Density:

Bulk Density (Electron Density)=1.90 gm/cc
note: Specific Gravity of Hydrochlorborite =1.84 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Hydrochlorborite}= 2.74 barns/electron
U=PE_{Hydrochlorborite} x rElectron Density= 5.21 barns/cc.

Radioactivity:

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

Hydrochlorborite Classification

Dana Class:

26.03.04.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.03)Dana Type

(26.03.04)Dana Group

26.03.04.01 Hydrochlorborite Ca2B4O4(OH)7Cl•7(H2O) I2/a 2/m

Strunz Class:

06.DA.30 06 - BORATES

06.D - Tetraborates

06.DA -Neso-tetraborates

06.DA.30 Hydrochlorborite Ca2B4O4(OH)7Cl•7(H2O) I2/a 2/m

Other Hydrochlorborite 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 Hydrochlorborite :
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 Hydrochlorborite Specimen Label here :

Hydrochlorborite

Ca2B4O4(OH)7Cl•7(H2O)
Dana No: 26.03.04.01 Strunz No: 06.DA.30
Locality:

Notes:

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