Fluorcalciobritholite

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Fluorcalciobritholite
Classificazione Strunz (ed. 10)	9.AH.25
Formula chimica	(Ca,REE)₅(SiO₄,PO₄)₃F
Proprietà cristallografiche
Gruppo cristallino	dimetrico
Sistema cristallino	esagonale
Classe di simmetria	bipiramidale
Parametri di cella	a = 9,58(7) Å, c = 6,985(4) Å, Z = 2, V = 555,2 Å³
Gruppo puntuale	6/m
Gruppo spaziale	P6₃/m
Proprietà fisiche
Densità	4,2 g/cm³
Durezza (Mohs)	5,5
Colore	da rosato a bruno
Lucentezza	vitrea
Opacità	trasparente, traslucida
Striscio	bianco
Si invita a seguire lo schema di Modello di voce – Minerale

La fluorcalciobritholite è un minerale appartenente al gruppo della britholite. È stata ritrovata sul monte Kukisvumchorr nella penisola di Kola in Russia. È un minerale dai cristalli esagonali prismatici, trasparente e colore dal rosa pallido al bruno^[1]. È simile alla fluorbritholite-(Ce) da cui si diversifica per la maggior prevalenza di calcio.

Abito cristallino

I cristalli del gruppo della britholite sono simili alla fluorapatite ma presentano oltre al gruppo fosfato anche il gruppo silicato ed in quantità più rilevante.

Origine e giacitura

Questa sezione sull'argomento mineralogia è ancora vuota. Aiutaci a scriverla!

Forma in cui si presenta in natura

La presenza di impurezze come torio uranio e altri lantanidi, rendono instabile la struttura cristallina per cui molti cristalli tendono a degradarsi col tempo (metamictismo).

Note

^ (EN) I.V. Pekov et al., Fluorcalciobritholite,(Ca,REE)₅[(Si,P)O₄]₃F, a new mineral: description and crystal chemistry, in European Journal of Mineralogy, vol. 19, n. 1, 2007, pp. 95–103. URL consultato il 29 ottobre 2024.

Collegamenti esterni

(EN) Fluorcalciobritholite Mineral Data, su webmineral.com.
(EN) Fluorcalciobritholite, su mindat.org.

V · D · M Minerali del supergruppo dell'apatite
gruppo dell'apatite	alforsite · apatite · clorapatite · fluoralforsite · fluorapatite · fluorpiromorfite · idrossiapatite · idrossilpiromorfite · johnbaumite · mimetite · ossipiromorfite · pieczkaite · pliniusite · piromorfite · stronadelphite · svabite · turneaureite · vanadinite
gruppo della belovite	belovite-(Ce) · belovite-(La) · carlgieseckeite-(Nd) · deloneite · fluorcaphite · fluorstrophite · kuannersuite-(Ce)
gruppo della britholite	britholite-(Ce) · britholite-(La) · britholite-(Y) · calciobritholite · fluorbritholite-(Ce) · fluorbritholite-(Nd) · fluorbritholite-(Y) · fluorcalciobritholite · tritomite-(Ce) · tritomite-(Y)
gruppo dell'ellestadite	clorellestadite · fluorellestadite · idrossilellestadite · mattheddleite
gruppo dell'hedyphane	aiolosite · caracolite · cesanite · fluorfosfohedyphane · fluorsigaiite · fosfohedyphane · hedyphane · idrossilhedyphane · miyahisaite · morelandite · parafiniukite
Non appartenenti ad alcun gruppo	vanackerite

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