Canavesite Mineral Data

Canavesite Mineral Data +

General Canavesite Information

Chemical Formula:

Mg2(CO3)(HBO3)·5(H2O)

Composition:

Molecular Weight = 258.51 gm

Magnesium 18.80 % Mg 31.18 % MgO

Boron 4.18 % B 13.47 % B₂O₃

Hydrogen 4.29 % H 38.33 % H₂O

Carbon 4.65 % C 17.02 % CO₂

Oxygen 68.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂(CO₃)(HBO₃)·5(H₂O)

Environment:

Found in fractures in ludwigite and magnetite skarns.

IMA Status:

Approved IMA 1978

Locality:

Vola Gera tunnel, Brosso iron mine, Canavese district, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Canavesite Image

Images:

Canavesite

Comments: White acicular crystals of canavesite on matrix.
Location: Brosso Mine, Ivrea, Piedmont, Italy. Scale: Picture size 9 mm.
© Thomas Witzke / Abraxas-Verlag

Canavesite Crystallography

Axial Ratios:

a:b:c =3.8108:1:3.5545

Cell Dimensions:

a = 23.49, b = 6.164, c = 21.91, Z = 12; beta = 114.91° V = 2,877.27 Den(Calc)= 1.79

Crystal System:

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

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

By Intensity(I/I_o): 9.54(1), 8.12(0.4), 4.56(0.21),3.11(0.2), 7.53(0.2), 7.8(0.2), 3.33(0.1), 3.69(0.1),

Physical Properties of Canavesite

Cleavage:

[h0l] Distinct, [h0l] Distinct

Color:

White.

Density:

1.8

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Canavesite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2764,KPDmeas= 0.2748,KC= 0.2576

Optical Data:

Biaxial (+), a=1.485, b=1.494, g=1.505, bire=0.0200, 2V(Calc)=86, 2V(Meas)=large.

Calculated Properties of Canavesite

Electron Density:

r_electron=1.87 gm/cc
note: r_Canavesite=1.80 gm/cc.

Fermion Index

Fermion Index = 0.02796
Boson Index = 0.97204

Photoelectric:

PE_Canavesite= 0.65 barns/electron
U=PE_Canavesite x r_electron= 1.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Canavesite is Not Radioactive

Canavesite Classification

Dana Class:

17.1.8.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.8)Dana Group

17.1.8.1 Canavesite Mg2(CO3)(HBO3)·5(H2O) P 2/m 2/m

Strunz Class:

V/G.06-40 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.06 - Berborite - Qilianshanite series

V/G.06-10 Berborite Be2(BO3)(OH,F)·(H2O) P 6₃ 6

V/G.06-20 Wightmanite Mg5(BO3)O(OH)5·2(H2O) I2/m 2/m

V/G.06-30 Shabynite Mg5(BO3)Cl2(OH)5·4(H2O) Unk. Mono

V/G.06-40 Canavesite Mg2(CO3)(HBO3)·5(H2O) P 2/m 2/m

V/G.06-50 Sakhaite Ca3Mg(BO3)2(CO3)·0.36(H2O) F 4₁32 4 3 2

V/G.06-60 Qilianshanite NaH4(CO3)(BO3)·2(H2O) C 2 2

Other Canavesite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Canavesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Canavesite

Mg2(CO3)(HBO3)·5(H2O)
Dana No: 17.1.8.1 Strunz No: V/G.06-40
Locality:

Notes: