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Mineral

Fluorapophyllite-(Cs)

fluorapophyllite-(Cs)
apophyllite with Stilbite Locality : Pandulena Hill, Nasik District, Maharashtra, India Size 39x31cm Mineral

Fluorapophyllite-(K)

fluorapophyllite-(K)

Formula
KCa4(Si8O20)F(H2O)8
Natroapophyllite Locality: Jalgaon District, Maharashtra, India (Locality at mindat.org) Size: miniature, 5.4 x 5.4 x 5 cm Apophyllite with inclusions We're still not sure what causes this odd yellowish color, but this is nearly a floater with just some edge damage on a back edge. Otherwise complete and amazingly equant all around! A holdover from a small find of middle of last year Mineral

Fluorapophyllite-(Na)

fluorapophyllite-(Na)

Formula
NaCa4(Si8O20)F * 8H2O
Fluorapophyllite-(NH4), Calcite Field of view: 6.2 mm Locality: Vechec quarry, Vechec, Vranov nad Topľou District, Prešov Region, Slovakia Description: Groups of pinkish pyramidal crystals of fluorapophyllite-(NH4) associated with calcite crystals. Fluorapophyllite-(NH4) was confirmed by EMPA-WDS and Raman spectroscopy. Self collected. Photographed by Pavel Škácha. Martin Števko collection.Ref.: Martin Števko, Jiří Sejkora, Jakub Plášil, Zdeněk Dolníček, Radek Škoda: Fluorapophyllite-(NH4), NH4Ca4(Si8O20)F⋅8H2O, a new member of the apophyllite group from the Vechec quarry, eastern Slovakia. In: Mineralogical Magazine, Volume 84, Issue 4, August 2020, pp. 533-539 DOI:10.1180/mgm.2020.44. Mineral

Fluorapophyllite-(Nh₄)

fluorapophyllite-(NH₄)
Mineral

Fluorarrojadite-(Bafe)

fluorarrojadite-(BaFe)

Formula
Na2CaBaFe²⁺Fe²⁺13Al(PO4)11(PO3OH)F2
Fluorarrojadite-(BaNa), Fluorapatite, Quartz Field of view: 40 mm Locality: Elisabeth Mine, Gemerská Poloma, Rožňava District, Košice Region, Slovakia Description: The largest known yellowish-green aggregate of fluorarrojadite-(BaNa) in quartz from the type locality. Minor green grains of fluorapatite are associated. Field of view is 40 mm. Fluorarrojadite-(BaNa) was confirmed by PXRD and EMPA-WDS. Self collected. Photographed by Pavel Škácha. Martin Števko collection.Ref.: Martin Števko, Jiří Sejkora, Pavel Uher, Fernando Cámara, Radek Škoda, Tomáš Vaculovič (2018): Fluorarrojadite-(BaNa), BaNa4CaFe13Al(PO4)11(PO3OH)F2, a new member of the arrojadite group from Gemerská Poloma, Slovakia. In: Mineralogical Magazine Volume 82, Issue 4, August 2018, pp. 863-876 DOI:10.1180/minmag.2017.081.066. Mineral

Fluorarrojadite-(Bana)

fluorarrojadite-(BaNa)

Formula
BaNa4CaFe13Al(PO4)11(PO3OH)F2
Mineral

Fluorbarytolamprophyllite

fluorbarytolamprophyllite

Formula
(Ba,Sr)2[(Na,Fe²⁺)3(Ti,Mg)F2][Ti2(Si2O7)2O2]
Mineral

Fluorbritholite-(Ce)

fluorbritholite-(Ce)

Formula
(Ce,Ca)5(SiO4)3F
Mineral

Fluorbritholite-(La)

fluorbritholite-(La)

Formula
Ca2La3(SiO4)3F
Back-scattered electron image of fluorbritholite-(Nd) (Fbri-Nd), an allanite-like mineral (Alnl), magnetite (Mag), fluorite (Flr) and dolomite (Dol). The white arrow points to a gatelite-like mineral. Sample GEO-NRM #20220221. Mineral

Fluorbritholite-(Nd)

fluorbritholite-(Nd)

Formula
Ca2Nd3(SiO4)3F
Mineral

Fluorbritholite-(Y)

fluorbritholite-(Y)

Formula
(Y,Ca)5(SiO4)3F
Mineral

Fluorcalciobritholite

fluorcalciobritholite

Formula
(Ca,REE)5(SiO4,PO4)3F
Mineral

Fluorcalciomicrolite

fluorcalciomicrolite

Formula
(Ca,Na,☐)2Ta2O6F
Rhabdophane-(Ce), Fluorcalciopyrochlore, Albite, Aegirine, Lorenzenite Field of view: 6.3 x 4.6 mm Locality: Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada Description: Found Nov 2001. “Fuzzy” orange fluorcalciopyrochlore on black aegirine with partly transparent pink albite (to 3.7 mm). The small tan needles on aegirine which can be seen in the gap between the two main albite crystals are lorenzenite, some apparently epitactic. (The lorenzenite has been verified via EDS. See [1] for a better example and an EDS scan.) The pyrochlore is clearly “fuzzy” because it is encrusted by more pyrochlore of similar compositio. There are a very few "naked" crystals (not on this specimen) that also appear to be yellowish. However, some of the crust can be removed with HCl, suggesting that it is cemented by calcite.Update April 2017: Quick and dirty EDS of uncoated samples on matrix seemed to show very high Ta for both the "crust" and the "naked" crystals (after removal of crust). For the "naked" crystals, peak heights for Ta > Nb were oberved, which would suggest "microlite group". However, consultation with a mineralogist very familiar with "pyrochlore" at MSH, strongly suggests that the "Ta" peaks are really "Si", and that this is just "pyrochlore" with lots of Si. According to the expert, high levels of Si have been found repeatedly in MSH pyrochlores. It is not know if this is because the pyrochlore is metamict or because Si has actually been incorporated into the pyrochlore structure (as has been suggested by some.)See the Analysis "photos" Feb 2018: The two "pyrochlore" species now confirmed at MSH are fluornatropyrochlore and fluorcalciopyrochlore, assuming that this too is a "fluor-pyrochlore" (EDS can't tell), it seems more likely that it is fluorcalciopyrochlore than fluornatropyrochlore. However, Na is detected with difficulty and its seeming near absence in the scans could be misleading. Nonetheless, I have tentatively changed the caption from "pyrochlore group" to "fluorcalciopyrochlore". Associated with abundant rhabdophane-(Ce) and acicular epididymite (both analyzed) with “bitumen” in a very dirty pegmatite. See the "related" (same minID) photos. Mineral

Fluorcalciopyrochlore

fluorcalciopyrochlore

Formula
(Ca,Na)2(Nb,Ti)2O6F
:Locality: Santa Matilde Quarry, Berja Mines, Las Herrerías, Andalusia, Spain Size: 7.4 × 5.5 × 5.2 cm Largest Crystal: 0.40cm Description: Analyzed species. At the beginning of 2014, reviewing some specimens from the Santa Matilde open pit we found into the vugs some groups of lanceolated, fibrous or equidimensional crystals, with pink, beige to white colours, those aroused our interest. After some analysis we could identify as fluorcalcioroméite species (Ca,Na)2Sb5+2O6(F,OH), with a small percentage of oxyplumboroméite (Pb2Sb2O7, due to the presence of lead). Both species belong to the isometric system. But the observed symmetry indicated that they are, highly probable, a pseudomorph after stibnite and/or bournonite crystals. This is the first report of this mineral in the Iberian Peninsula. Nowadays this quarry is completelly filled by rubble. In this specimen we can see some aggregates, one of them predominant, formed by several lanceolated to needle-like crystals, with luster, beige to ocher tone, accompanied by aesthetic baryte crystals. We will send a copy of the analysis (SEM-EDS, XRD) to the buyer. Collected: 2004 Mineral

Fluorcalcioroméite

fluorcalcioroméite

Formula
(Ca,Na)2Sb⁵⁺2O6F
Mohs
5.5
Mineral

Fluorcanasite

fluorcanasite

Formula
K3Na3Ca5Si12O30F4·H2O
Fluorcaphite Locality: Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Greenish transparent crystals of Fluorcaphite. Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Fluorcaphite

fluorcaphite

Formula
SrCaCa3(PO4)3F
Mohs
5
Fluorcarletonite-containing charoitite. The specimen is deposited at the Sidorov State Mineralogical Museum (Irkutsk, Russia). 1 – aegirine, 2 – pectolite, 3 – charoite, 4 – apophyllite-(KF), 5 – fluorcarletonite. The image is published in an article (Kaneva, E., Radomskaya, T., Suvorova, L., Sterkhova, I., and Mitichkin, M.: Crystal chemistry of fluorcarletonite, a new mineral from the Murun alkaline complex (Russia), Eur. J. Mineral., 32, 137–146, https://doi.org/10.5194/ejm-32-137-2020, 2020.) distributed with an open acces license. Mineral

Fluorcarletonite

fluorcarletonite
Mineral

Fluorcarmoite-(Bana)

fluorcarmoite-(BaNa)

Formula
Ba☐ Na2Na2☐ CaMg13Al(PO4)11(PO3OH)F2
Mineral

Fluorchegemite

fluorchegemite

Formula
Ca7(SiO4)3F2
Ellestadite-(F), Calcite Locality: Commercial quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Riverside County, California, USA (Locality at mindat.org) Size: 5.1 x 4.0 x 2.7 cm. A large crystal of yellow fluorine-rich ellestadite to 1.5 cm, trapped in beautiful blue calcite. These are common enough as microcrystalline material from this locality, but few crystals of such size (and in good condition) are found. Quite exceptional for the species. NOTE: Texas Industries is the current owner of Riverside Cement and the cement plant there has been shut down since a week before Christmas 2008. Mineral

Fluorellestadite

fluorellestadite
Fluorit, Quarz und Psilomelan aus der Okorusu Mine, Namibia; ausgestellt in der Mineralienausstellung „terra Mineralia“ der TU Bergakademie Freiberg (identifiziert nach Anfrage per Mail durch Andreas Massanek, Kustos der terra mineralia) Mineral

Fluorite

Formula
CaF2
Mohs
4
Colour
Purple, green, blue, yellow, colourless
Mineral

Fluorkyuygenite

fluorkyuygenite

Formula
Ca12Al14O32[(H2O)4F2]
Sharp yellow crystals of the very rare mineral fluorlamprophyllite (IMA 2013-102) from the type locality (Morro do Serrote, Cascata, Minas Gerais, Brazil) and only known locality worldwide. Mineral

Fluorlamprophyllite

fluorlamprophyllite

Formula
(SrNa)Ti2Na3Ti(Si2O7)2O2F2