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Originally described from Hackman Valley, Yukspor Mt., Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
Classification of Foshallasite
|IMA status:||Discredited 2006|
|Strunz 8th edition ID:||8/C.09-60|
|Nickel-Strunz 10th (pending) edition ID:||9.HA.55|
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
|Dana 8th edition ID:||18.104.22.168|
56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in  and/or > coordination
|Hey's CIM Ref.:||14.5.22|
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Optical Data of Foshallasite
|RI values:||nα = 1.535 nβ = 1.542 nγ = 1.549|
|2V:||Measured: 12° to 18°, Calculated: 88°|
|Maximum Birefringence:||δ = 0.014|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v weak|
Chemical Properties of Foshallasite
|Simplified for copy/paste:||Ca3[Si2O7]·3H2O(?)|
|Essential elements:||Ca, H, O, Si|
|All elements listed in formula:||Ca, H, O, Si|
Relationship of Foshallasite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Foshallasite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
Internet Links for Foshallasite
Localities for Foshallasite
(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.
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New Locality Added: Pontével, Cartaxo, Santarém District, PortugalFrom Rui Nunes, 25th Oct 2014 21:07:20