User:Chris857/Tunellite

Tunellite
Tunellite
	Tunellite from California
General
Category	Mineral
Formula; (repeating unit)	SrB6O9(OH)2·3H2O
Strunz classification	6.FC.05
Dana classification	26.6.6.2
Crystal system	Monoclinic
Space group	H-M group: 2/m; Point group: P21/a
Unit cell	a = 14.415(3) Å; b = 8.213(1) Å; c = 9.951(2) Å; β = 114.05°; Z = 4
Identification
Color	Colorless to grayish white
Cleavage	Perfect on {100}; Distinct on {001}
Tenacity	Flexible, inelastic, sectile
Mohs scale hardness	2.5
Luster	Sub-vitreous, pearly
Diaphaneity	Transparent
Optical properties	Biaxial (+)
Refractive index	nα = 1.519; nβ = 1.534; nγ = 1.569
Birefringence	δ = 0.050
2V angle	68° (calculated)
References

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Description edit

^[1]

Occurrence edit

History edit

References edit

^ ^a ^b ^c Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Tunellite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.
^ "Tunellite". Mindat. Retrieved January 5, 2013.

Bibliography

External links edit

Media related to tunellite at Wikimedia Commons

[handbook-1] Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Tunellite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.

[mindat-2] "Tunellite". Mindat. Retrieved January 5, 2013.

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