Fivegite (original) (raw)

A valid IMA mineral species

About FivegiteHide

This section is currently hidden. Click the show button to view.

Formula:

K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl

Crystal System:

Orthorhombic

Name:

Named for Russian geologist and mine engineer Mikhail Pavlovich Fiveg (Михаил Павлович Фивег) (8 (20) September 1899, Divensky, St. Petersburg province, Russian Empire - 11 January 1986, Leningrad, USSR), specialist in nonmetallic mineral deposits, especially apatite, who lead the first prospecting team for apatite in the Khibiny massif (1928-1933).

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:39711:5

a7bfdf4d-6746-4762-be67-b42a0f33114c

IMA Classification of FivegiteHide

This section is currently hidden. Click the show button to view.

IMA Formula:

K4Ca2[AlSi7O17(O2-x(OH)x)][(H2O)2-x(OH)x]Cl (x = 0-2)

Classification of FivegiteHide

This section is currently hidden. Click the show button to view.

9.EB.30

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of FivegiteHide

This section is currently hidden. Click the show button to view.

Cleavage:

Perfect
Perfect on {100} and distinct on {010}

Density:

2.42(2) g/cm3 (Measured) 2.449 g/cm3 (Calculated)

Optical Data of FivegiteHide

This section is currently hidden. Click the show button to view.

RI values:

_n_α = 1.540(1) _n_β = 1.542(2) _n_γ = 1.544(2)

δ = 0.004

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of FivegiteHide

This section is currently hidden. Click the show button to view.

Mindat Formula:

K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl

Crystallography of FivegiteHide

This section is currently hidden. Click the show button to view.

Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

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

Comment:

Space group setting: Pm21n

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of FivegiteHide

This section is currently hidden. Click the show button to view.

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

This section is currently hidden. Click the show button to view.

Relationship of Fivegite to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Fluorescence of FivegiteHide

This section is currently hidden. Click the show button to view.

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

Other InformationHide

This section is currently hidden. Click the show button to view.

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.

Internet Links for FivegiteHide

This section is currently hidden. Click the show button to view.

References for FivegiteHide

This section is currently hidden. Click the show button to view.

Reference List:

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.

Tait, K.T., Belakovskiy, D., Welch, M.D., Gatta, G.D., Cámara, F. (2012) New mineral names. American Mineralogist, 97, 1260-1265.

Localities for FivegiteHide

This section is currently hidden. Click the show button to view.

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 section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.