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Qandilite: (Mg,Fe++)2(Ti,Fe+++,Al)O4
Comments: Small black grains of qandilite in a forsterite skarn rock matrix. Location: Dupezeh Mt., Hero, Qala-Diz (Qala-Dizeh; Qala-Diza), Iraq. Scale: Picture Size 0.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: B&W photograph in plane-polarized light showing rounded fractured serpentinized olivine surrounded by the interstitial calcite (C), qandilite (Q), perovskite (P), and altered Mg,Al-spinel (Sp). (MinMag, v49:739). Location: Forsterite-rich rock in contact with a kaersutite-rich banded diorite from the Qala-Dizeh region, NE Iraq. Scale: See Image. © Mineralogical Magazine
Qaqarssukite-(Ce): Ba(Ce,REE)(CO3)2F
Comments: SEM image showing a blocky, stepped group of qaqarssukite-(Ce) crystals with several broken needles of strontianite. (CanMin, v44:1137). Location: Qaqarssuk complex, Greenland. Scale: See Image. © Canadian Mineralogist
Quadratite: Ag(Cd,Pb)AsS3
Comments: Tabular crystals of quadratite with small silvery gray, rounded crystals of galena. Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Aggregate of 3 black tabular crystals of quadratite (reflecting light) on jordanite/lengenbachite and white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 0.2 mm. © Walter Gabriel
Quadridavyne: (Na,K)6Ca2Al6Si6O24Cl4
Comments: Colorless hexagonal crystals of quadridavyne. Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Quartz: SiO2 Calcite: CaCO3
Comments: Purple-colored druse of amethystine quartz and white calcite. Location: Rio Grande do Sul, Brazil. Scale: Sample size 20 cm. © Dave Barthelmy
Quartz: SiO2 Chalcopyrite: CuFeS2
Comments: Well-formed crystals of chalcopyrite and quartz. Location: Boldut mine, 61 level (350 meters deep), Cavnic, Maramures, Rumania. Scale: 5.5 x 3.5 cm. © Fabre Minerals
Quartz: SiO2 Ilvaite: CaFe++2Fe+++Si2O7O(OH)
Comments: Black, prismatic ilvaite with quartz. Location: First Sovietskij mine, Dalnjegorsk, Russia. Scale: 3.5 x 4.5 cm. © Fabre Minerals
Quartz: SiO2
Comments: Crystal druse of transparent quartz crystals. Location: Hot Springs, Arkansas, USA. Scale: Specimen size 6 cm. © Dave Barthelmy
Quartz: SiO2 Apatite-(CaF): Ca5(PO4)3F
Comments: Purple crystal of fluorapatite on slightly smoky quartz crystals. Former Dr. E.E. David and Houston Museum collections. Location: Pech, Kunar Province, Nuristan, Afghanistan. Scale: Crystal size 3.0 x 2.1 x 1.7 cm. © Ed Rosenzweig
Quartz: SiO2 Epistilbite: CaAl2Si6O16·5(H2O)
Comments: White epistilbite cluster 25 mm across on amethyst quartz crystal matrix. Location: Sawda, Jalgaon, Maharashtra, India. Scale: 10x8x5 cm. © John Betts - Fine Minerals
Comments: Slightly smokey quartz overgrown with rose quartz. Note the exceptional transparency of the rose quartz. Location: Lavra da Ilha, Taquaral, Minas Gerais, Brazil. Scale: 10 cm by 5.2 cm. © Kevin Ward
Queitite: Pb4Zn2(SiO4)(Si2O7)(SO4)
Comments: White earthy queitite masses on quartz. Location: Tombstone, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Quenselite: PbMn+++O2(OH)
Comments: Square crystal of quenselite on matrix. Location: Langban, Sweden. Scale: Crystal size 1 mm. © John Veevaert
Comments: Jet black tabular crystals of quenselite, some striated on matrix. Location: Langban, Varmland, Sweden. Scale: Crystal size 1.75mm. © Tom Loomis / Dakota Matrix
Quenstedtite: Fe+++2(SO4)3·10(H2O)
Comments: White crystalline quenstedtite crust. Location: Richelsdorf, Hessen, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Quetzalcoatlite: Zn8Cu4(TeO3)3(OH)18
Comments: Green encrustation of quetzalcoatlite. Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Quintinite-2H: Mg4Al2(OH)12CO3·4(H2O) Quintinite-3T: Mg4Al2(OH)12CO3·4(H2O)
Comments: Pale brownish crystals of quintinite, 2H or 2T polytype unknown. Location: Jacupiranga Mine, São Paulo, Southeast Region, Brazil. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
Quintinite-3T: Mg4Al2(OH)12CO3·4(H2O) Quintinite-2H: Mg4Al2(OH)12CO3·4(H2O)