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Minerals

6323 results

Black Fencooperite in colourless sanbornite. From: Trumbull Peak Ba-silicate deposit, Trumbull Peak, Clearing House, Clearing House Mining District, East Belt, Mariposa Co., California, USA. Mineral

Fencooperite

fencooperite

Formula
Ba6Fe³⁺3Si8O23(CO3)2Cl3·H2O
Mineral

Fengchengite

fengchengite

Formula
Na12☐3(Ca,Sr)6Fe³⁺3Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2
Occurrence and mineral association of fengruiite. (A) Fengruiite (Frui) in a galena–quartz vein under reflected light; the box marks the area enlarged in (B). (B) Fengruiite intergrown with galena (Gn), chalcopyrite (Ccp), and cervelleite (Cvl) under reflected light; the box marks the area shown in (C). (C) Backscattered-electron image of the area outlined in (B). Additional abbreviations: Ank, ankerite; Qz, quartz. Mineral

Fengruiite

fengruiite

Formula
[Ag6Sb2S7][Ag9CuS2Te2]
Mineral

Feodosiyite

feodosiyite

Formula
Cu11Mg2Cl18(OH)8·16H2O
Black ferberite crystals with muscovite (6.0 × 4.0 × 3.0 cm). Found from Panasqueira mines, Beira Baixa, Portugal Mineral

Ferberite

ferberite

Formula
Fe²⁺WO4
Small golden rounded crystal of the extremely rare intermetallic minerals chromferide & ferchromide from the type locality in Russia (Efim Area, Kumak, Orenburg Oblast, Russian Federation), and associated to marialite, graphite and skapolite. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Ferchromide

ferchromide

Formula
Cr3Fe1-x
Mohs
6.5
Mineral

Ferdowsiite

ferdowsiite

Formula
Ag8(Sb5As3)S16
Fergusonite crystals embedded in feldspar and biotite, type locality: Ytterby/Sweden, formula: (Y,Ce,La,Nd)NbO4, ratio RE metals: 4:1:3:2 Mineral

Fergusonite-(Ce)

fergusonite-(Ce)

Formula
(Ce,La,Nd)NbO4
Fergusonite crystals embedded in feldspar and biotite, type locality: Ytterby/Sweden, formula: (Y,Ce,La,Nd)NbO4, ratio RE metals: 4:1:3:2 Mineral

Fergusonite-(Nd)

fergusonite-(Nd)

Formula
(Nd,Ce)(Nb,Ti)O4
Fergusonite-(Y) Locality: Ambalabe pegmatite, Manapa pegmatite Field, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar (Locality at mindat.org) Size: 3.3 x 3.0 x 2.3 cm. Very sharp, lustrous, black crystals to 1.0 cm in parallel-growth very nicely set on a glassy cleavage of banded smoky quartz. Mineral

Fergusonite-(Y)

fergusonite-(Y)

Formula
YNbO4
Mineral

Ferhodsite

ferhodsite

Formula
(Fe,Rh,Ni,Ir,Cu,Pt)9S8
Mineral

Fermiite

fermiite

Formula
Na4(UO2)(SO4)3·3H2O
Dark green crystals of the very rare mineral fernandinite associated to yellow crystals of the also rare pintadoite. Both are vanadium minerals and have only been found in a few localities worldwide. From: Slick Rock District, San Miguel County, Colorado, United States of America. Mineral

Fernandinite

fernandinite

Formula
(Ca,Na,K)0.9(V⁵⁺,V⁴⁺,Fe²⁺,Ti)8O20·4H2O
Brown crystal group of the rare Fe hydroxide feroxyhyte from a locality in Montana (Missoula County, Montana, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Feroxyhyte

feroxyhyte

Formula
Fe³⁺O(OH)
Ferraioloite - Portugal, Folgosinho, Sítio do Castelo Mine - 4 mm. Collection Pierre Rosseel Mineral

Ferraioloite

ferraioloite

Formula
MgMn²⁺4(Fe²⁺0.5Al³⁺0.5)4Zn4(PO4)8(OH)4(H2O)20
Mineral

Ferrarisite

ferrarisite

Formula
Ca5(AsO3OH)2(AsO4)2·9H2O
Mineral

Ferri-Fluoro-Katophorite

ferri-fluoro-katophorite

Formula
Na(NaCa)(Mg4Fe³⁺)(Si7Al)O22F2
Mineral

Ferri-Fluoro-Leakeite

ferri-fluoro-leakeite

Formula
NaNa2(Mg2Fe³⁺2Li)Si8O22F2
Colour
black
Outstanding yellow brown sharp crystals of the rare mineral ferri-ghoseite from Italy (Varenche Mine, Saint-Barthélemy, Nus, Aosta Valley, Italy). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Ferri-Ghoseite

ferri-ghoseite

Formula
☐(NaMn²⁺)(Mg4Fe³⁺)Si8O22(OH)2
Mineral

Ferri-Hellandite-(Ce)

ferri-hellandite-(Ce)
FOV ~ 4 x 6 mm. Found August 1999. MOB coll. According to Horváth et al (Min Rec 1990), kaersutite “is readily identifiable by its perfect prismatic cleavage and red internal reflections”. This photo attempts to show the perferct cleavage. At the top you can see that there are actually two perfect cleavages at an “amphibole angle". The fracture “perpendicular” to these is conchoidal and very glassy. Note: Per László (private comminication March 2017), all analyzed "kaersutite" is actually the new species ferri-kaersutite (IMA2014-051). The sample also displays the red highliughts but they hardly show up at this angle of illumination. See http://www.mindat.org/photo-173584.html for more than you may want to know about kaersutite at MSH and a pointer to a more general discussion about the mineral. Apart from the kaersutite – which altogether spans about 2½ x 2½ cm – this specimen is of interest because of the presence of "ilmenohematite" (~ 90% hematite) and apatite, neither of which appears on the MSH "list" for this environment (Lapis 2000) Mineral

Ferri-Kaersutite

ferri-kaersutite

Formula
NaCa2(Mg3Fe³⁺Ti)Si6Al2O22O2
Black crystals of the rare silicate mineral ferri-katophorite (labeled as the varity magnesioferri-katophorite in the plastic box) in a white contrasting matrix. From Kipawa, Sheffield Lake, Les Lacs-du-Témiscamingue, Abitibi-Témiscamingue, Québec, Canada. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Ferri-Katophorite

ferri-katophorite

Formula
Na(NaCa)(Mg4Fe³⁺)(Si7Al)O22(OH)2
Dark mauve-red prismatic crystals of the very rare mineral ferri-leakeite from the TL in India and only one of 4 known localities worldwide (Kajlidongri Mine, Jhabua District, Madhya Pradesh, India). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Ferri-Leakeite

ferri-leakeite

Formula
NaNa2(Mg2Fe³⁺2Li)Si8O22(OH)2
Mohs
6
BSE images of hellandite-(Ce) (Hel-(Ce)) and ferri-mottanaite-(Ce) (Fe-mot-(Ce)). (a) Crystal n.1 of hellandite-(Ce); (b) Crystal n.1 of hellandite-(Ce) with pyrochlore (Pcl) group members inclusion; (c) Cribrose core of crystal n.2 of hellandite-(Ce); (d) Hellandite-(Ce)-ferri-mottanaite-(Ce) exsolution in crystal n.2. The light bands represent hellandite-(Ce), the darker ferri-mottanaite-(Ce); (e) Ferri-mottanaite-(Ce) in close association with baddeleyite (Bdy) in crystal 2; (f) Brockite (Brck) disseminated in hellandite-(Ce)-ferri-mottanaite-(Ce) exsolution; (g) Crystal n.3 of ferri-mottanaite-(Ce); (h) Crystal n. 4 showing the cribrose core of hellandite-(Ce) and rim of ferri-mottanaite-(Ce). This image is published in an article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Ferri-Mottanaite-(Ce)

ferri-mottanaite-(Ce)