This page is currently not sponsored. Click here to sponsor this page.
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:||220.127.116.11|
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
Please feel free to link to this page.
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.
|Fade toolbar when not in focus||Fix toolbar to bottom of page|
|Hide Social Media Links|
|Slideshow frame delay||seconds|