Falcondoite information

Falcondoite
Falcondoite
General
Category	Phyllosilicate
Formula; (repeating unit)	(Ni,Mg)4Si6O15(OH)2·6H2O
IMA symbol	Fcd
Strunz classification	9.EE.25
Crystal system	Orthorhombic
Crystal class	Dipyramidal (2/m 2/m 2/m) ; (same H-M symbol)
Space group	Pncn
Unit cell	a = 13.5 Å, b = 26.9 Å ; c = 5.24 Å; α=90° = β=90° = γ=90°; Z = 4
Identification
Color	Whitish-green
Crystal habit	Fibrous and microscopic crystals
Cleavage	Distinct
Fracture	Friable
Tenacity	Brittle
Mohs scale hardness	2 - 3
Luster	Resinous
Streak	White
Diaphaneity	Translucent
Specific gravity	1.9
Density	1.9 g/cm3
Optical properties	Biaxial
Birefringence	δ=0.01 - 0.02
Dispersion	r < v strong
Ultraviolet fluorescence	Non-fluorescent
References

Falcondoite, a member of the sepiolite group, was first discovered in the Dominican Republic, near the town of Bonao. The mineral was found in a deposit mined by Falconbridge Dominica, and so was named "falcondoite" after the company. Falcondoite is frequently associated with sepiolite, garnierite, talc, and serpentine, and is commonly nickel-bearing. While the chemical formula for falcondoite can vary, the mineral must contain more nickel than magnesium to be considered its own species.^[4] The ideal chemical formula for falcondoite is (Ni,Mg)₄Si₆O₁₅(OH)₂·6H₂O.^[2]

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b "Falcondoite". www.mindat.org. Retrieved 2021-12-06.
^ Cite error: The named reference :3 was invoked but never defined (see the help page).
^ Springer, G (1976). "Falcondoite, Nickle Analogue of Sepiolite". Canadian Mineralogist. 14: 407–409.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[:1-2] "Falcondoite". www.mindat.org. Retrieved 2021-12-06.

[:3-3] Cite error: The named reference :3 was invoked but never defined (see the help page).

[:0-4] Springer, G (1976). "Falcondoite, Nickle Analogue of Sepiolite". Canadian Mineralogist. 14: 407–409.

Falcondoite information

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Falcondoite

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Kaolinite

Phlogopite

Serpentine subgroup

Talc

Biotite

Lizardite

Vermiculite

Illite

Chlorite group

Chrysotile

Antigorite

Montmorillonite

Clay mineral

Lepidolite

Sepiolite

List of mineral symbols

Glauconite

Chrysocolla

Muscovite

Halloysite

Palygorskite

Smectite

Phengite

Saponite

Pyrophyllite

Dickite

Allophane