Larderellite Mineral Data

Larderellite Mineral Data +

General Larderellite Information

Chemical Formula:

(NH4)B5O6(OH)4

Composition:

Molecular Weight = 236.11 gm

Boron 22.89 % B 73.71 % B₂O₃

Hydrogen 1.71 % H - % Calc as (NH₄)₂O

Hydrogen 1.71 % H 15.26 % H₂O

Nitrogen 5.93 % N 11.03 % (NH₄)₂O

Oxygen 67.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)B₅O₆(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Lardarello, Val di Cecina, Pisa, Toscana, Italy Link to MinDat.org Location Data.

Name Origin:

Named for count Francesco de Larderelle (1848-1925), owner of the "BORAX mine" in Tuscany, Italy

Larderellite Image

Images:

Larderellite

Comments: Colorless larderellite crystals.
Location: Larderello, Cecina Valley, Pisa province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Larderellite Crystallography

Axial Ratios:

a:b:c =1.6265:1:1.3212

Cell Dimensions:

a = 11.63, b = 7.15, c = 9.447, Z = 4; beta = 96.75° V = 780.12 Den(Calc)= 2.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.887(1), 2.921(1), 4.7(1),

Physical Properties of Larderellite

Cleavage:

[100] Perfect

Color:

Yellowish, White.

Density:

1.905

Hardness:

1-2 - Between Talc and Gypsum

Streak:

white

Optical Properties of Larderellite

Gladstone-Dale:

CI meas= -0.323 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.253 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2637,KPDmeas= 0.2782,KC= 0.2104

Optical Data:

Biaxial (+), a=1.509, b=1.52, g=1.561, bire=0.0520, 2V(Calc)=56, 2V(Meas)=64.

Calculated Properties of Larderellite

Electron Density:

r_electron=2.04 gm/cc
note: r_Larderellite=2.01 gm/cc.

Fermion Index

Fermion Index = 0.10498
Boson Index = 0.89502

Photoelectric:

PE_Larderellite= 0.33 barns/electron
U=PE_Larderellite x r_electron= 0.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Larderellite is Not Radioactive

Larderellite Classification

Dana Class:

26.5.4.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.4)Dana Group

26.5.4.1 Larderellite (NH4)B5O6(OH)4 P 2₁/a 2/m

Strunz Class:

V/J.05-10 V - Nitrates, Carbonates and Borates

V/J - Chain borates with [B2O4]2- to [B6O10]2-

V/J.05 - Larderellite - Kaliborite series

V/J.05-10 Larderellite (NH4)B5O6(OH)4 P 2₁/a 2/m

V/J.05-20 Ezcurrite Na4B10O17·7(H2O) P1 1

V/J.05-30 Probertite NaCaB5O7(OH)4·3(H2O) P 2₁/a 2/m

V/J.05-40 Kaliborite KHMg2B12O16(OH)10·4(H2O) C 2/c 2/m

Other Larderellite Information

References:

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

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Larderellite

(NH4)B5O6(OH)4
Dana No: 26.5.4.1 Strunz No: V/J.05-10
Locality:

Notes: