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:

Santite   Ramanite-(Rb)   Ramanite-(Cs) 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 - PyramidalH-M Symbol (mm2) Space Group: Aba2 X Ray Diffraction: By Intensity(I/I_o): 3.36(1), 3.52(0.85), 5.6(0.7), Crystal Structure:

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Zachariasen W H , Zeitschrift fur Kristallographie , 98 (1937) p.266-274, The crystal structure of potassium acid dihydronium, pentaborate KH2(H3O)2B5O10, (potassium pentaborate tetrahydrate), Locality: synthetic

 

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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