Santite Mineral Data

General Santite Information

Chemical Formula:

KB5O6(OH)4•2(H2O)

Composition:

Molecular Weight = 293.20 gm

Potassium 13.33 % K 16.06 % K₂O

Boron 18.43 % B 59.36 % B₂O₃

Hydrogen 2.75 % H 24.58 % H₂O

Oxygen 65.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KB₅O₆(OH)₄•2(H₂O)

Environment:

Formed in fumaroles, probably a product of reaction between potassium-rich solutions and larderellite

IMA Status:

Approved IMA 1970

Locality:

Larderello, Val di Cecina, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Giorgio Santi (1746-1822), Italian chemist and Director, Museum of Natural History, University of Pisa, Pisa, Italy.

Name Pronunciation:

Santite

Synonym:

ICSD 18211

PDF 25-624

Santite Image

Images:

Ramanite-(Rb) Ramanite-(Cs) Santite

Comments: Unheated Type-B melt inclusions in graphic quartz. 1 = ramanite-(Cs), 2 = sassolite, 3 = ramanite-(Rb), 4 = santite, 5 = topaz, V = vapor. (AmMin, v93:1035).
Location: Graphic pegmatite quartz from the Island of Elba, Italy. Scale: Scale Bar 15µm.
© American Mineralogist

Santite Crystallography

Axial Ratios:

a:b:c =0.9928:1:0.8121

Cell Dimensions:

a = 11.1, b = 11.18, c = 9.08, Z = 4; V = 1,126.81 Den(Calc)= 1.73

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Aba2

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

By Intensity(I/I_o): 3.36(1), 3.52(0.85), 5.6(0.7),

Physical Properties of Santite

Color:

Colorless.

Density:

1.735

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Santite

Gladstone-Dale:

CI meas= -0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2576,KPDmeas= 0.2569,KC= 0.2427
Ncalc = 1.42

Optical Data:

Biaxial (+), a=1.422, b=1.435, g=1.48, bire=0.0580

Calculated Properties of Santite

Electron Density:

Bulk Density (Electron Density)=1.75 gm/cc
note: Specific Gravity of Santite =1.74 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Santite= 1.59 barns/electron
U=PE_Santite x r_electron= 2.79 barns/cc.

Radioactivity:

GRapi = 194.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Santite per GRapi unit = 0.51 (%)

Estimated Radioactivity from Santite - barely detectable

Santite Classification

Dana Class:

26.05.02.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.02)Santite Group

26.05.02.01 Santite KB5O6(OH)4•2(H2O) Aba2 mm2

26.05.02.02 Ramanite-(Rb)! Rb[B5O6(OH)4]•2H2O Aba2 mm2

26.05.02.03 Ramanite-(Cs)! Cs[B5O6(OH)4]•2H2O C 2/c 2/m

Strunz Class:

06.EA.10 06 - BORATES

06.E - Pentaborates

06.EA -Neso-pentaborates

06.EA.10 Santite KB5O6(OH)4•2(H2O) Aba2 mm2

06.EA.10 Ramanite-(Rb)! Rb[B5O6(OH)4]•2H2O Aba2 mm2

06.EA.10 Ramanite-(Cs)! Cs[B5O6(OH)4]•2H2O C 2/c 2/m

Other Santite 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 Santite :
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

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

Santite

KB5O6(OH)4•2(H2O)
Dana No: 26.05.02.01 Strunz No: 06.EA.10
Locality:

Notes:

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