Winchite (original) (raw)

Formula:

◻{CaNa}{Mg4Al}(Si8O22)(OH)2

The winchite-group minerals are defined as sodium-calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<1.5 apfu. The W position may contain (OH),F or Cl.

Winchite is defined with
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant.

Colour:

Cobalt-blue to violet-blue, lavender-gray, gray, colorless

Specific Gravity:

2.97 - 3.175

Crystal System:

Monoclinic

Name:

Named in honour of Howard James Winch (1877, Buckhurst Hill, Essex, England - 1964, Essex, England) analytical chemist, mineralogist, metallurgist, and mining engineer with the Kajlidongri quarry, who discovered of the mineral. He also discovered hollandite.

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 9.834 Å, b = 18.062 Å, c = 5.300 Å
β = 104.45°

Ratio:

a:b:c = 0.544 : 1 : 0.293

Unit Cell V:

911.61 ų (Calculated from Unit Cell)

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0020107	Winchite	Jenkins D M, Della Ventura G, Oberti R, Bozhilov K (2013) Synthesis and characterization of amphiboles along the tremolite-glaucophane join American Mineralogist 98 588-600	2013	synthetic	0	293
0020108	Winchite	Jenkins D M, Della Ventura G, Oberti R, Bozhilov K (2013) Synthesis and characterization of amphiboles along the tremolite-glaucophane join American Mineralogist 98 588-600	2013	synthetic	0	293
0005710	Winchite	Sokolova E V, Hawthorne F C, Gorbatova V, McCammon C, Schneider J (2001) Ferrian winchite from the Ilmen mountains, southern Urals, Russia and some problems with the current scheme for amphibole nomenclature adjusted to match reported bond lengths The Canadian Mineralogist 39 171-177		2001	Ilmen mountains, southern Urals, Russia	0	293
0007426	Winchite	Ghose S, Kersten M, Langer K, Rossi G, Ungaretti L (1986) Crystal field spectra and Jahn Teller effect of Mn3+ in clinopyroxene and clinoamphiboles from India Physics and Chemistry of Minerals 13 291-305	1986	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.