Megacyclite
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About Megacyclite
Formula:
Na8KSi9O18(OH)9 · 19H2O
Colour:
Colorless
Lustre:
Vitreous, Sub-Vitreous
Hardness:
2
Specific Gravity:
1.82
Crystal System:
Monoclinic
Name:
The name is from the Greek for 'large' and 'cyclical', alluding to the structure of large, ringlike groups consisting of 18Si04 tetrahedra.
This page provides mineralogical data about Megacyclite.
Classification of Megacyclite
Approved
8/E.24-10
9.CP.10
9 : SILICATES (Germanates)
C : Cyclosilicates
P : 12-membered and larger rings
9 : SILICATES (Germanates)
C : Cyclosilicates
P : 12-membered and larger rings
62.1.2.1
62 : CYCLOSILICATES Eight-Membered Rings
1 : Eight-Membered Rings with 8-membered and larger rings
62 : CYCLOSILICATES Eight-Membered Rings
1 : Eight-Membered Rings with 8-membered and larger rings
Physical Properties of Megacyclite
Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 on Mohs scale
Cleavage:
Perfect
Perfect {100},less perfect {001}
Perfect {100},less perfect {001}
Fracture:
Step-Like
Density:
1.82(5) g/cm3 (Measured) 1.87 g/cm3 (Calculated)
Optical Data of Megacyclite
Type:
Biaxial (-)
RI values:
nα = 1.460 nβ = 1.478 nγ = 1.481
2V:
Measured: 44° , Calculated: 44°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemical Properties of Megacyclite
Formula:
Na8KSi9O18(OH)9 · 19H2O
IMA Formula:
KNa8Si9O18(OH)9 · 19H2O
Crystallography of Megacyclite
Crystal System:
Monoclinic
Cell Parameters:
a = 24.91 Å, b = 11.94 Å, c = 14.92 Å
β = 94.47°
β = 94.47°
Ratio:
a:b:c = 2.086 : 1 : 1.25
Unit Cell V:
4,424.09 ų (Calculated from Unit Cell)
Type Occurrence of Megacyclite
Place of Conservation of Type Material:
Mining Institute, St..Petersburg, 2066/1.
A.E. Fersman Mineralogical Museum, Academy of Science, Moscow, Russia, p733/2.
A.E. Fersman Mineralogical Museum, Academy of Science, Moscow, Russia, p733/2.
Synonyms of Megacyclite
Other Language Names for Megacyclite
Related Minerals - Nickel-Strunz Grouping
| 9.CP.05 | Traskite | Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O | Hex. |
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.
References for Megacyclite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Khomyakov, A.P., Necheljustov, G.N., Yamnova, N.A., Pushcharovsky, D.Y. (1993) Megacyclite Na8KSi9O18(OH)9·19H2O — a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 122(1): 125-128.
Jambor, J.L., Roberts, A.C., Vanko, D.A. (1994) New mineral names. American Mineralogist: 79: 1009-1014.
New Minerals (1997), New Minerals 1990-1994.
Zubkova, N.V., Pekov, I.V., Chukanov, N.V., Listsin, D.V., Rabadanov, M.K., Pushcharovsky, D.Y. (2007) New data on megacyclite. New Data on Minerals. Moscow: 42: 81-92.
Krivovichev, S.V. (2013) Structural complexity of minerals: information storage and processing in the mineral world. Mineralogical Magazine: 77: 275-326.
Zubkova, N.V., Pekov, I.V., Pushcharovsky, D.Y. (2014) A review of crystal chemistry of natural silicates of alkaline elements in the light of new structural data. Mineralogical Magazine: 78: 253-265.
Internet Links for Megacyclite
mindat.org URL:
https://www.mindat.org/min-2626.html
Please feel free to link to this page.
Please feel free to link to this page.
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Localities for Megacyclite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Am Min 79:1011; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow |
| Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia. Zapiski RMO, 139(1), 37-50. |
| Pekov I.V.. et al. (2009) Egorovite Na4[Si4O8(OH)4]·7H2O - new mineral from Lovozero alkaline massif (Kola peninsula) - Zapiski RMO, v. 138, №3, pp. 82-89 (in Rus.) |
Palitra pegmatite, Karnasurt mine, Kedykverpakhk Mt, Lovozero Massif, Murmanskaya Oblast', Northern Region, Russia