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Foshallasite

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Formula:
Ca3[Si2O7] · 3H2O(?)
Originally described from Hackman Valley, Yukspor Mt., Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.

Classification of Foshallasite

Discredited 2006
9.HA.55

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
56.2.9.3

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
14.5.22

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Optical Data of Foshallasite

Type:
Biaxial (-)
RI values:
nα = 1.535 nβ = 1.542 nγ = 1.549
2V:
Measured: 12° to 18°, Calculated: 88°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v weak

Chemical Properties of Foshallasite

Formula:
Ca3[Si2O7] · 3H2O(?)
Essential elements:
All elements listed in formula:
Common Impurities:
TR,Na

Relationship of Foshallasite to other Species

9.HA.05ErtixiiteNa2Si4O9
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2O
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6
9.HA.30AfanasyevaiteCa8[Si2O7]OCl2
9.HA.40IgumnoviteCa3Al2(SiO4)2Cl4
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2O
9.HA.60NagelschmidtiteCa7(SiO4)2(PO4)2
9.HA.65Caryochroite(Na,Sr)3(Fe3+,Mg)10[(O,OH)9|Ti2Si12O37] · (H2O,O,OH)17
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or near
9.HA.75TacharaniteCa12Al2Si18O51 · 18H2O
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2O
9.HA.85DenisoviteCa2(K,Na)Si3O8(F,OH)2
9.HA.90Tiettaite(Na,K)17FeTiSi16O29(OH)30 · 2H2O
14.5.1WollastoniteCaSiO3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2MCaSiO3
14.5.4RankiniteCa3Si2O7
14.5.5KilchoaniteCa6(SiO4)(Si3O10)
14.5.6LarniteCa2SiO4
14.5.7BredigiteCa7Mg(SiO4)4
14.5.8HatruriteCa3(SiO4)O
14.5.9RosenhahniteHCa3[Si3O9(OH)]
14.5.10DellaiteCa6(Si2O7)(SiO4)(OH)2
14.5.11AfwilliteCa3(HSiO4)2 · 2H2O
14.5.12XonotliteCa6(Si6O17)(OH)2
14.5.13FoshagiteCa4(Si3O9)(OH)2
14.5.14HillebranditeCa2(SiO3)(OH)2
14.5.15JaffeiteCa6(Si2O7)(OH)6
14.5.16SuoluniteCa2(H2Si2O7) · H2O
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2
14.5.18OkeniteCaSi2O5 · 2H2O
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2O
14.5.20TrabzoniteCa4(Si3O10) · 2H2O
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.25NekoiteCa3Si6O15·7H2O
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2O

Other Names for Foshallasite

Name in Other Languages:

Other Information

Health Risks:
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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Yukspor Mt
[World of Stones 95:5-6, p64]
Mineral and/or Locality  
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