Ammonioborite Mineral Data

General Ammonioborite Information

Chemical Formula:

(NH4)2B10O16•5(H2O)

Composition:

Molecular Weight = 490.24 gm

Boron 22.05 % B 71.00 % B₂O₃

Hydrogen 1.64 % H - % Calc as (NH₄)₂O

Hydrogen 2.06 % H 18.37 % H₂O

Nitrogen 5.71 % N 10.62 % (NH₄)₂O

Oxygen 68.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂B₁₀O₁₆•5(H₂O)

Environment:

Boric acid-rich fumarolic lagoons.

IMA Status:

Valid Species (Pre-IMA) 1931

Locality:

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

Name Origin:

Named for its composition, ammonium borate.

Name Pronunciation:

Ammonioborite + Pronunciation

Synonym:

ICSD 23532

PDF 12-637

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Ammonioborite Crystallography

Axial Ratios:

a:b:c =2.6186:1:1.1979

Cell Dimensions:

a = 25.27, b = 9.65, c = 11.56, Z = 6; beta = 94.287° V = 2,811.08 Den(Calc)= 1.74

Crystal System:

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

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

By Intensity(I/I_o): 3.09(1), 3.16(1), 5.7(0.6),

Crystal Structure:

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Merlino S , Sartori F , Science , 171 (1971) p.377-379, Ammonioborite: New borate polyion and its structure

Physical Properties of Ammonioborite

Cleavage:

None

Color:

White.

Density:

1.765

Diaphaneity:

Translucent

Streak:

white

Optical Properties of Ammonioborite

Gladstone-Dale:

CI meas= -0.314 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.333 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2868,KPDmeas= 0.2827,KC= 0.2151
Ncalc = 1.37 - 1.38

Optical Data:

Biaxial (+), a=1.47, b=1.487, g=1.54, bire=0.0700, 2V(Calc)=62, 2V(Meas)=60.

Calculated Properties of Ammonioborite

Electron Density:

Bulk Density (Electron Density)=1.80 gm/cc
note: Specific Gravity of Ammonioborite =1.77 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_{Ammonioborite}= 0.33 barns/electron
U=PE_{Ammonioborite} x rElectron Density= 0.60 barns/cc.

Radioactivity:

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

Ammonioborite Classification

Dana Class:

26.05.03.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.03)Dana Group

26.05.03.01 Ammonioborite (NH4)2B10O16•5(H2O) C 2/c 2/m

Strunz Class:

06.EA.15 06 - BORATES

06.E - Pentaborates

06.EA -Neso-pentaborates

06.EA.15 Ammonioborite (NH4)2B10O16•5(H2O) C 2/c 2/m

Other Ammonioborite 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 Ammonioborite :
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 Ammonioborite Specimen Label here :

Ammonioborite

(NH4)2B10O16•5(H2O)
Dana No: 26.05.03.01 Strunz No: 06.EA.15
Locality:

Notes: