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Megacyclite

Formula:
Na
 
8
KSi
 
9
O
 
18
(OH)
 
9
·19H
 
2
O
System:MonoclinicHardness:2
This page provides mineralogical data about Megacyclite.

Classification of Megacyclite

IMA status:Approved
Strunz 8th edition ID:8/E.24-10
Nickel-Strunz 10th (pending) edition ID:9.CP.10

9 : SILICATES (Germanates)
C : Cyclosilicates
P : 12-membered and larger rings
Dana 8th edition ID:62.1.2.1

62 : CYCLOSILICATES Eight-Membered Rings
1 : Eight-Membered Rings with 8-membered and larger rings
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Type Occurrence of Megacyclite

Type Locality:Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1993

Physical Properties of Megacyclite

Hardness (Mohs):2

Crystallography of Megacyclite

Crystal System:Monoclinic
Cell Parameters:a = 24.91Å, b = 11.94Å, c = 14.92Å
β = 94.47°
Ratio:a:b:c = 2.086 : 1 : 1.25
Unit Cell Volume:V 4,424.09 ų (Calculated from Unit Cell)

Optical Data of Megacyclite

Type:Biaxial (-)
RI values: nα = 1.460 nβ = 1.478 nγ = 1.481
2V:Measured: 44° , Calculated: 44°
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong

Chemical Properties of Megacyclite

Formula:
Na
 
8
KSi
 
9
O
 
18
(OH)
 
9
·19H
 
2
O
Essential elements:H, K, Na, O, Si
All elements listed in formula:H, K, Na, O, Si

Relationship of Megacyclite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.CP.05Traskite
Ba
 
9
Fe
 
2
Ti
 
2
Si
 
12
O
 
36
(OH,Cl,F)
 
6
·6H
 
2
O

Other Names for Megacyclite

Synonyms:
IMA1991-015
Other Languages:
German:Megacyclit
Russian:Мегациклит
Spanish:Megacyclita

Other Information

Health Warning: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:American Mineralogist (1994): 79: 1011.

New Minerals (1997), New Minerals 1990-1994.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 122(1): 125-128.

Articles/Blogs about Megacyclite

Internet Links for Megacyclite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Megacyclite details from Handbook of Mineralogy (PDF)
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    Localities for Megacyclite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    Am Min 79:1011
    Mineral and/or Locality
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