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Fluorocronite

A valid IMA mineral species

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Photos of Fluorocronite (4)Discuss Fluorocronite

Fluorocronite Gallery Search Photos of Fluorocronite

Edit Fluorocronite Add Synonym Edit CIF structures Clear Cache

Fluorocronite

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite, etc.

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite, etc.

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite, etc.

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite, etc.

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Fluorocronite, etc.

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Hide all sections | Show all sections

About FluorocroniteHide

Formula:

PbF₂

Colour:

White

Lustre:

Pearly

Hardness:

3 - 4

Specific Gravity:

7.619 (Calculated)

Crystal System:

Isometric

Member of:

Fluorite Group

Name:

The name is in relation to the composition; fluoro (for fluorine) and cron (κρόνος, the alchemical name for lead).

Type Locality:

ⓘ Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Isostructural with:

Fluorite

Fluorite Group.

The Pb-analogue of fluorite, frankdicksonite and strontiofluorite.

Unique IdentifiersHide

Mindat ID:

40179

Long-form identifier:

mindat:1:1:40179:1

IMA Classification of FluorocroniteHide

IMA status:

Approved

IMA Formula:

Pb²⁺F₂

Approval year:

2010

First published:

2011

Type description reference:

Mills, Stuart J., Kartashov, Pavel M., Gamyanin, Gennadii N., Whitfield, Pamela S., Kern, Arnt, Guerault, Hugues, Kampf, Anthony R., Raudsepp, Mati (2011) Fluorocronite, the natural analogue of β-PbF₂, from the Sakha Republic, Russian Federation. European Journal of Mineralogy, 23 (4) 695-700 doi:10.1127/0935-1221/2011/0023-2136

Classification of FluorocroniteHide

Strunz-mindat (2026):

3.AB.

3 : HALIDES
A : Simple halides, without H₂O
B : M:X = 1:2

Mineral SymbolsHide

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

Symbol	Source	Reference for Standard
Flc	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FluorocroniteHide

Lustre:

Pearly

Transparency:

Translucent

Colour:

White

Streak:

White

Hardness:

3 - 4 on Mohs scale

Cleavage:

Perfect
{111}, by analogy with other minerals of the fluorite structure.

Parting:

None observed

Density:

7.619 g/cm³ (Calculated)

Comment:

Could not be measured due to small grain size. Calculated value varies with Pb vs Sn.

Optical Data of FluorocroniteHide

Type:

Isotropic

Comments:

Synthetic b-PbF2 has n = 1.766 at 587 nm

Chemistry of FluorocroniteHide

Mindat Formula:

PbF₂

Element Weights:

Element	% weight
Pb	84.504 %
F	15.497 %

Calculated from ideal end-member formula.

Elements listed:

F, Pb - search for minerals with similar chemistry

Crystallography of FluorocroniteHide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Fm3m

Cell Parameters:

a = 5.9306(5) Å

Unit Cell V:

208.59 Å³ (Calculated from Unit Cell)

Morphology:

Flattened, leaf-like crystals (low Sn). Elongated prismatic crystals, with elongation about 5:1 (high Sn).

Twinning:

None observed.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0018631	Fluorocronite	Achary S N, Tyagi A K (2005) Synthesis and characterization of mixed fluorides with PbF2 and ScF3 Powder Diffraction 20 254-258		2005	synthetic	0	293
0011705	Fluorocronite	Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Fluorite structure Crystal Structures 1 239-444		1963		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Fluorocronite'
loop_
_publ_author_name
'Achary S N'
'Tyagi A K'
_journal_name_full 'Powder Diffraction'
_journal_volume 20 
_journal_year 2005
_journal_page_first 254
_journal_page_last 258
_publ_section_title
;
 Synthesis and characterization of mixed fluorides with PbF2 and ScF3
;
_database_code_amcsd 0018631
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Pb F2'
_cell_length_a 5.9397
_cell_length_b 5.9397
_cell_length_c 5.9397
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 209.553
_exptl_crystal_density_diffrn      7.772
_symmetry_space_group_name_H-M 'F m 3 m'
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loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Pb   0.00000   0.00000   0.00000
F   0.25000   0.25000   0.25000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.437 Å	(100)
2.976 Å	(46)
2.103 Å	(44)
1.794 Å	(42)
1.717 Å	(21)

Locality:

Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

Reference:

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47g : [Halogen-bearing surface weathering minerals]

Type Occurrence of FluorocroniteHide

Type Locality:

ⓘ Kupol'noe Ag–Sn deposit, Sarychev Range, Oymyakonsky District, Sakha, Russia

General Appearance of Type Material:

Macroscopically, white masses coat larger encrustations of cream-coloured cassiterite. Microscopically, flattened, leaf-like microcrystals up to about 20 µm, with a thickness of less than 1 µm.

Sn-bearing fluorocronite forms single, elongated prismatic crystals (with elongation about 5:1) up to 15 µm long, found on top of aggregates of Sn oxy-hydroxide.

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Moscow, Russia, catalogue number 3987/1.
Natural History Museum of Los Angeles County, California, USA, catalogue number 63316.

Geological Setting of Type Material:

Supergene alteration, formed under ambient surface conditions from the weathering of galena and Pb-bearing sulphosalts.

Associated Minerals at Type Locality:

Anglesite	Bindheimite	Cassiterite	Cerussite	Chlorargyrite
Galena	Hocartite	Quartz

Reference:

Synonyms of FluorocroniteHide

IMA2010-023

Other Language Names for FluorocroniteHide

Dutch:Fluorocroniet

German:Fluorocronit

Russian:Фторокронит

Relationship of Fluorocronite to other SpeciesHide

Member of:

Fluorite Group

Other Members of Fluorite Group:

Fluorite	CaF₂	Iso. m3m(4/m32/m) : Fm3m
Frankdicksonite	BaF₂	Iso. m3m(4/m32/m) : Fm3m
Strontiofluorite	SrF₂	Iso. m3m(4/m32/m) : Fm3m

Common AssociatesHide

Associations Based on Photo Data:

2 photos of Fluorocronite associated with Cassiterite

SnO₂

Related Minerals - Strunz-mindat Grouping Hide

3.AB.	Manuelarossiite	PbCaAlF₇	Mon. 2/m : B2/m
3.AB.05	Tolbachite	CuCl₂	Mon. 2/m : B2/m
3.AB.10	Coccinite	HgI₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/nmc
3.AB.15	Sellaite	MgF₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
3.AB.20	Lawrencite	(Fe²⁺,Ni)Cl₂	Trig. 3m(32/m) : R3m
3.AB.20	Scacchite	MnCl₂	Trig. 3m(32/m) : R3m
3.AB.20	Chloromagnesite	MgCl₂	Trig. 3m(32/m) : R3m
3.AB.25	Fluorite	CaF₂	Iso. m3m(4/m32/m) : Fm3m
3.AB.25	Frankdicksonite	BaF₂	Iso. m3m(4/m32/m) : Fm3m
3.AB.25	Strontiofluorite	SrF₂	Iso. m3m(4/m32/m) : Fm3m
3.AB.30	Tveitite-(Y)	(Y, Na)₆Ca₆Ca₆(Ca,Na)F₄₂	Trig. 3 : R3
3.AB.35	Gagarinite-(Y)	NaCaYF₆	Hex. 6/m : P6₃/m
3.AB.35	Polezhaevaite-(Ce)	NaSrCeF₆	Hex. 6/m : P6₃/m
3.AB.35	Gagarinite-(Ce)	Na(REE_xCa_1-x)(REE_yCa_1-y)F₆	Trig. 3 : P3
3.AB.37	Calcioaravaipaite	PbCa₂AlF₉	Tric. 1 : P1
3.AB.85	Cotunnite	PbCl₂	Orth. mmm(2/m2/m2/m)

Fluorescence of FluorocroniteHide

In UV light:

Not fluorescent.

Other InformationHide

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 FluorocroniteHide

mindat.org URL:

https://www.mindat.org/min-40179.html
Please feel free to link to this page.

Search Engines:

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External Links:

Look for Fluorocronite on Webmineral

Look for Fluorocronite on Wikipedia

Look for Fluorocronite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for FluorocroniteHide

Reference List:

Soubeyroux, J.L., Matar, S.F., Reau, J.M., Hagenmuller, P. (1984) Etude des proprietes structurales et electriques de la solution solide Pb1-xBixOxF2-x. Solid State Ionics: 14: 337-345.

Laborde, P.; Réau, J.M.; Hagenmuller, P. (1987) Influence de la substitution oxygene-fluor sur les proprietes electriques de la solution solide Pb1−xBixF2+x. Materials Research Bulletin, 22 (6). p.723-734. doi:10.1016/0025-5408(87)90025-0

Reau, J.M.; Elomari, M.; Senegas, J.; Hagenmuller, P. (1989) Correlations entre proprietes electriques et ordre a courte distance au sein de la solution solide Pb1−xBixF2+x. Materials Research Bulletin, 24 (12). p.1441-1452. doi:10.1016/0025-5408(89)90154-2

Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 4. Mineralogical Magazine, 74 (4) 797-800 doi:10.1180/s0026461x00038925

Gatta, G. D., Camara, F., Tait, K. T., Belakovskiy, D. (2012) New Mineral Names. American Mineralogist, 97 (11) 2064-2072 doi:10.2138/am.2012.603

(2017) Fluorocronite. Handbook of Mineralogy. Mineralogical Society of America

Localities for FluorocroniteHide

Showing 1 localities.

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.

Hide all sections | Show all sections

Locality ListHide

- 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.

Russia (TL)

Sakha

Oymyakonsky District

Sarychev Range

ⓘ Kupol'noe Ag–Sn deposit (TL)

Williams et al. (2010) +1 other reference

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Fluorocronite

About FluorocroniteHide

Unique IdentifiersHide

IMA Classification of FluorocroniteHide

Classification of FluorocroniteHide

Mineral SymbolsHide

Physical Properties of FluorocroniteHide

Optical Data of FluorocroniteHide

Chemistry of FluorocroniteHide

Crystallography of FluorocroniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of FluorocroniteHide

Synonyms of FluorocroniteHide

Other Language Names for FluorocroniteHide

Relationship of Fluorocronite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of FluorocroniteHide

Other InformationHide

Internet Links for FluorocroniteHide

References for FluorocroniteHide

Localities for FluorocroniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide