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Larderellite

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Larderello, Pomarance, Pisa Province, Tuscany, Italy
© Thomas Witzke

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Formula:
(NH
 
4
)B
 
5
O
 
6
(OH)
 
4
System:MonoclinicColour:White, yellowish due to ...
Name:After F. de Larderell, a Proprietor of the Tuscan borax industry.
Dimorph of:Ammonioborite
This page provides mineralogical data about Larderellite.

Classification of Larderellite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/J.05-10
Nickel-Strunz 10th (pending) edition ID:6.EB.05

6 : BORATES
E : Pentaborates
B : Ino-pentaborates
Dana 8th edition ID:26.5.4.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
Hey's CIM Ref.:9.1.14

9 : Borates
1 : Borates of the alkalis and boric acid
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Type Occurrence of Larderellite

Type Locality:Larderello, Pomarance, Pisa Province, Tuscany, Italy
Year of Discovery:1854
Geological Setting of type material:Boric acid fumaroles in a volcanic region.
Associated Minerals at type locality:
SassoliteAmmonioborite

Physical Properties of Larderellite

Diaphaneity (Transparency):Translucent
Colour:White, yellowish due to impurities; colourless in transmitted light
Cleavage:Perfect
On {001} (?) and {010} (?).

Crystallography of Larderellite

Crystal System:Monoclinic
Cell Parameters:a = 11.63Å, b = 7.61Å, c = 9.44Å
β = 96.75°
Ratio:a:b:c = 1.528 : 1 : 1.24
Unit Cell Volume:V 829.69 ų (Calculated from Unit Cell)
Morphology:Microscopic rhomboidal tablets flattened {100}. The acute plane angle of the rhombs is ~ 68°.

Optical Data of Larderellite

Type:Biaxial (+)
RI values: nα = 1.509 nβ = 1.520 nγ = 1.561
2V:Measured: 64° , Calculated: 56°
Maximum Birefringence:δ = 0.052

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Larderellite

Formula:
(NH
 
4
)B
 
5
O
 
6
(OH)
 
4
Essential elements:B, H, N, O
All elements listed in formula:B, H, N, O

Relationship of Larderellite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.EB.10Ezcurrite
Na
 
4
B
 
10
O
 
17
·7H
 
2
O
6.EB.15Probertite
NaCaB
 
5
O
 
7
(OH)
 
4
·3H
 
2
O
6.EB.20Tertschite
Ca
 
4
B
 
10
O
 
19
·20H
 
2
O
6.EB.25Priceite
Ca
 
2
B
 
5
O
 
7
(OH)
 
5
·H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
9.1.1Sassolite
H
 
3
BO
 
3
9.1.2Metaborite
HBO
 
2
9.1.3Diomignite
Li
 
2
[B
 
4
O
 
7
]
9.1.4Biringuccite
Na
 
2
B
 
5
O
 
8
(OH)·H
 
2
O
9.1.5Nasinite
Na
 
4
B
 
10
O
 
17
·5H
 
2
O
9.1.6Kernite
Na
 
2
[B
 
4
O
 
6
(OH)
 
2
] · 3H
 
2
O
9.1.7Ezcurrite
Na
 
4
B
 
10
O
 
17
·7H
 
2
O
9.1.8Tincalconite
Na
 
2
[B
 
4
O
 
7
] · 5H
 
2
O
9.1.9Borax
Na
 
2
[B
 
4
O
 
7
] · 10H
 
2
O
9.1.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
9.1.11Sborgite
Na[B
 
5
O
 
6
(OH)
 
4
] · 3H
 
2
O
9.1.12Aristarainite
Na
 
2
MgB
 
12
O
 
20
·8H
 
2
O
9.1.13Santite
K[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
9.1.15Ammonioborite
(NH
 
4
)
 
2
[B
 
5
O
 
6
(OH)
 
4
]
 
2
 · H
 
2
O
9.1.16Rhodizite
(K,Cs)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28

Other Names for Larderellite

Other Languages:
French:Borate de Chaux
German:Larderellit
Russian:Лардереллит
Spanish:Larderellita

Other Information

Other Information:Decomposed by hot water.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Larderellite

Reference List:Mascagni (1806) Viagg. Tosc.: 3.

Beudant, F.S. (1832), Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 249 (as Borate de Chaux).

Alger-Phillips (1844): 318 (as Borocalcite).

Bechi (1854) American Journal of Science: 17: 129.

Forbes (1863) Philosophical Magazine and Journal of Science: 25: 113 (as Hayesine ?).

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 597 (as Bechilite).

D'Achiardi (1872): 1: 258.

Des Cloizeaux, A. (1874) Manuel de minéralogie. 2 volumes and Atlas, Paris. volume 2, 1 Fasc., 208pp.: 2: 9.

D'Achiardi (1900) Rendus Reale accademia nazionale dei Lincei, Rome: 9: 342.

van't Hoff (1907) Akademie der Wissenschaften, Berlin (Sitzungsberichte der): 652.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 98.

D'Achiardi G. (1930): - Nuovi dati e ricerche sulla larderellite. Periodico di Mineralogia - Roma pp. 208-213.

Millosevich (1930) Periodico di Mineralogia - Roma: 1: 214.

D'Achiardi G. (1932) Periodico di Mineralogia - Roma pp.: 3: 1.

D'Achiardi G. (1932): Considerazioni e ricerche sulla larderellite, ammonioborite (?) e bechilite (?) di Larderello (Pisa). Periodico di Mineralogia - Roma pp. 36-42.

Hintze, Carl (1933) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 165.

Schaller (1933) American Mineralogist: 18: 485.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 365-366.

American Mineralogist (1960): 45: 1087-1093.

Acta Crystallographica (1969): B25: 2264-2270.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

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    Localities for Larderellite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Italy
     
    • Tuscany
      • Pisa Province
        • Pomarance
    		D'Achiardi G. (1930): - Nuovi dati e ricerche sulla larderellite. Periodico di Mineralogia - Roma pp. 208-213. and Millosevich F. (1930)- Larderellite e paternoite. pp. 214-215. Periodico di Mineralogia - Roma and D'Achiardi G. (1932): Considerazioni e ricerche sulla larderellite, ammonioborite (?) e bechilite (?) di Larderello (Pisa). Periodico di Mineralogia - Roma pp. 36-42.
    Mineral and/or Locality
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