Chevkinite-(Ce) (original) (raw)

Formula:

Ce4(Ti,Fe2+,Fe3+)5O8(Si2O7)2

Also given as (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8.

Lustre:

Resinous, Sub-Metallic

Specific Gravity:

4.53 - 4.67

Crystal System:

Monoclinic

Name:

Named in 1839 by Gustav Rose in honor of Konstantin Vladimirovich Chevkin (Константин Владимирович Чевкин) (26 April 1803, Kamianets-Podolsk, Ukraine - 3 November 1875, Nice France), Chief of Staff of the Russian Corps of Mining Engineers. Originally named simply chevkinite, the suffix was added by the IMA in 1987 to follow the Levinson rule for denoting the dominant rare-earth element.

Easily confused with perrierite-(Ce).

May bear some Ti3+ that may be related to Nb(V) enrichment (Stachowicz, 2019).

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 13.370(3) Å, b = 5.660(2) Å, c = 11.280(3) Å
β = 100.87(3)°

Ratio:

a:b:c = 2.362 : 1 : 1.993

Unit Cell V:

838.29 ų (Calculated from Unit Cell)

Twinning:

Twin plane {001}.

Comment:

Some material is metamict.

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005956	Chevkinite-(Ce)	Sokolova E V, Hawthorne F C, Della Ventura G, Kartashov P M (2004) Chevkinite-(Ce): Crystal structure and the effect of moderate radiation-induced damage on site-occupancy refinement Crystal (1) The Canadian Mineralogist 42 1013-1025		2004	Mongolia	0	293
0005957	Chevkinite-(Ce)	Sokolova E V, Hawthorne F C, Della Ventura G, Kartashov P M (2004) Chevkinite-(Ce): Crystal structure and the effect of moderate radiation-induced damage on site-occupancy refinement Reported formula: (Ce1.85 La1.11 Nd.53 Pr.15 Sm.04 Gd.03 Ca.32 Th.02) (Fe2+.85 Mn2+.04 Zr.03 Y.03 Ca.05) (Ti2.54 Fe3+1.19 Nb.15) Si4.06 O22 Crystal (2) The Canadian Mineralogist 42 1013-1025		2004	Mongolia	0	293
0005958	Chevkinite-(Ce)	Sokolova E V, Hawthorne F C, Della Ventura G, Kartashov P M (2004) Chevkinite-(Ce): Crystal structure and the effect of moderate radiation-induced damage on site-occupancy refinement Reported formula: (Ce1.85 La1.11 Nd.53 Pr.15 Sm.04 Gd.03 Ca.32 Th.02) (Fe2+.85 Mn2+.04 Zr.03 Y.03 Ca.05) (Ti2.54 Fe3+1.19 Nb.15) Si4.06 O22 Crystal (2an) The Canadian Mineralogist 42 1013-1025		2004	Mongolia	0	293
0005959	Chevkinite-(Ce)	Sokolova E V, Hawthorne F C, Della Ventura G, Kartashov P M (2004) Chevkinite-(Ce): Crystal structure and the effect of moderate radiation-induced damage on site-occupancy refinement Reported formula: (Ce1.88 La1.01 Nd.61 Pr.19 Sm.06 Gd.03 Ca.27 Y.03 Th.02) (Fe2+.93 Mn.06 Zr.01) (Ti2.55 Fe3+1.29 Nb.16) Si3.91 O22 Crystal (3an) The Canadian Mineralogist 42 1013-1025		2004	Mongolia	0	293

CIF Raw Data - click here to close

- 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.