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Fivegite

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About FivegiteHide

Formula:
K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl
Colour:
Colourless
Lustre:
Vitreous, Pearly
Hardness:
4
Specific Gravity:
2.42
Crystal System:
Orthorhombic
Name:
Named for Russian geologist and mine engineer Mikhail Pavlovich Fiveg (1899-1986), specialist in nonmetallic mineral deposits, especially apatite, who lead the first prospecting team for apatite in the Khibiny massif (1928-1933).
Related to rhodesite.


Classification of FivegiteHide

Approved
Approval Year:
2009

Physical Properties of FivegiteHide

Vitreous, Pearly
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100} and distinct on {010}
Fracture:
Step-Like
Density:
2.42(2) g/cm3 (Measured)    2.449 g/cm3 (Calculated)

Optical Data of FivegiteHide

Type:
Biaxial (+)
RI values:
nα = 1.540(1) nβ = 1.542(2) nγ = 1.544(2)
2V:
Measured: 60° (10)
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of FivegiteHide

Formula:
K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl
IMA Formula:
K4Ca2[AlSi7O17(O2-x(OH)x)][(H2O)2-x(OH)x]Cl (x = 0-2)

Crystallography of FivegiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 24.335(2) Å, b = 7.0375(5) Å, c = 6.5400(6) Å
Ratio:
a:b:c = 3.458 : 1 : 0.929
Unit Cell V:
1120 ų
Z:
2
Comment:
Space group setting: Pm21n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.517 (38)
3.072 (100)
3.040 (46)
2.943 (47)
2.893 (53)
2.880 (41)
2.759 (25)
1.759 (30)

Type Occurrence of FivegiteHide

General Appearance of Type Material:
Pseudomorphs after roughly formed prismatic (with pyramidal termination) delhayelite crystals up to 2 × 3 × 10 cm in size and their intergrowths.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia (registration number 3881/1).
Geological Setting of Type Material:
In a hyperalkaline pegmatite body hosted in urtite close to the contact with nepheline–apatite rock. Fivegite is a secondary mineral that replaces delhayelite.
Associated Minerals at Type Locality:

Synonyms of FivegiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Delhayelite1 photo of Fivegite associated with Delhayelite on mindat.org.
Aegirine1 photo of Fivegite associated with Aegirine on mindat.org.

Fluorescence of FivegiteHide

Strong pink under LW UV and white with a lilac tint under SW UV. Non-fluorescent variety of fivegite was also identified.

Other InformationHide

Notes:
Fivegite is less brittle than delhayelite; its fine plates (fragments of splitting) are able to bend slightly but generally remain inelastic.
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 FivegiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Chukanov, N.V., Zadov, A.E. and Pushcharovsky, D.Yu. (2010): Fivegite, K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl, a new mineral from the Khibiny alkaline massif (Kola Peninsula, Russia). Zapiski Rossiyskogo Mineralogicheskogo Obshchestva, 139(4), 47-63 (in Russian). English translation: (2011) Geology of Ore Deposits, 53, 591-603.

Internet Links for FivegiteHide

Localities for FivegiteHide

This 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.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
        • Rasvumchorr Mt
          • Rasvumchorr Mine
Pekov I.V., Zubkova N.V., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu.: Fivegite, K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl, a new mineral from the Khibiny alkaline complex, Kola Peninsula, Russia // Zapiski RMO (in press).
Mineral and/or Locality  
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