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About LarderelliteHide

(NH4)B5O7(OH)2 · H2O
White, yellowish due to impurities; colourless in transmitted light
Crystal System:
After F. de Larderell, a Proprietor of the Tuscan borax industry.
Dimorph of:
This page provides mineralogical data about Larderellite.

Classification of LarderelliteHide

Approved, 'Grandfathered' (first described prior to 1959)

E : Pentaborates
B : Ino-pentaborates

5 : Pentaborates

9 : Borates
1 : Borates of the alkalis and boric acid

Physical Properties of LarderelliteHide

White, yellowish due to impurities; colourless in transmitted light
On {001} (?) and {010} (?).

Optical Data of LarderelliteHide

Biaxial (+)
RI values:
nα = 1.509 nβ = 1.520 nγ = 1.561
Measured: 64° , Calculated: 56°
Max Birefringence:
δ = 0.052
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of LarderelliteHide

(NH4)B5O7(OH)2 · H2O

Crystallography of LarderelliteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
9.45 Å(50)
5.44 Å(71)
5.12 Å(50)
4.70 Å(100)
2.960 Å(71)
2.921 Å(100)
2.887 Å(100)

Type Occurrence of LarderelliteHide

Geological Setting of Type Material:
Boric acid fumaroles in a volcanic region.
Associated Minerals at Type Locality:

Other Language Names for LarderelliteHide

Related Minerals - Nickel-Strunz GroupingHide

6.EB.10EzcurriteNa4B10O17 · 7H2OTric. 1 : P1
6.EB.15ProbertiteNaCaB5O7(OH)4 · 3H2OMon. 2/m
6.EB.20TertschiteCa4B10O19 · 20H2O
6.EB.25PriceiteCa2B5O7(OH)5 · H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.1.1SassoliteH3BO3Tric. 1 : P1
9.1.4BiringucciteNa2B5O8(OH) · H2OMon.
9.1.5NasiniteNa2[B5O8(OH)] · 2H2OOrth.
9.1.6KerniteNa2[B4O6(OH)2] · 3H2OMon. 2/m : P2/b
9.1.7EzcurriteNa4B10O17 · 7H2OTric. 1 : P1
9.1.8TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
9.1.11SborgiteNa[B5O6(OH)4] · 3H2OMon.
9.1.12AristarainiteNa2MgB12O20 · 8H2OMon. 2/m : P21/b
9.1.13SantiteK[B5O6(OH)4] · 2H2OOrth.
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2OMon. 2/m : B2/b
9.1.16Rhodizite(K,Cs)Al4Be4(B,Be)12O28Iso. 4 3m : P4 3m

Other InformationHide

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

References for LarderelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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, E. (1854) Analysis of several native borates: larderellite, (new species). American Journal of Science: 67: 129-130.
Forbes, D. (1863) On the chemical composition of some Chilian minerals. Philosophical Magazine and Journal of Science: 25: 103-114. (as Hayesine, pg 113)
Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 597 (as Bechilite).
D'Achiardi, A. (1872) Mineralogia Della Toscana: 1: 258.
Des Cloizeaux, A. (1874) Manuel de minéralogie. 2 volumes and Atlas, Paris. volume 2, 1 Fasc., 208pp.: 2: 9.
D'Achiardi, G. (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: 1: 208-213.
Millosevich, F. (1930) Larderellite e paternoite. Periodico di Mineralogia - Roma: 1: 214-215.
D'Achiardi G. (1932) Considerazioni e ricerche sulla larderellite, ammonioborite (?) e bechilite (?) di Larderello (Pisa). Periodico di Mineralogia - Roma: 3: 36-42.
Hintze, C. (1933) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 165.
Schaller, W.T. (1933) Ammonioborite, a new mineral. American Mineralogist: 18: 480-492.
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.
Clark, J.R., Christ, C.L. (1959) Studies of borate minerals (VII): X-Ray studies of ammonioborite, larderellite, and the potassium and ammonium pentaborate tetrahydrates. American Mineralogist: 44: 1150-1158.
Clark, J.R. (1960) X-ray crystallography of larderellite, NH4B5O6(OH)4. American Mineralogist: 45: 1087-1093.
Merlino, S., Sartori, F. (1969) The crystal structure of larderellite, NH4B5O7(OH)2·H2O. Acta Crystallographica: B25: 2264-2270.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Anderson, Y.E., Bubnova, R.S., Filatov, S.K., Polyakova, I.G., Krzhizhanovskaya, M.G. (2005) Thermal behavior of larderellite, NH4[B5O7(OH)2]·H2O. Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva: 134(1): 103-113.

Internet Links for LarderelliteHide

Localities for LarderelliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Campostrini, I., Demartin, F., Gramaccioli, C. M. & Russo, M. (2011): Vulcano - Tre secoli di mineralogia. Associazione Micro-mineralogia Italiana, Cremona, Italy, 344 pp.
  • Tuscany
    • Pisa Province
      • Pomarance
D'Achiardi G. (1930): - Nuovi dati e ricerche sulla larderellite. Periodico di Mineralogia - Roma pp. 208-213; 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; Chukanov, N.V. (2014) Infrared spectroscopy of minerals. Extended library. Volume 1. Springer, Dordrecht Heidelberg New York London, page 46 and 67.
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