Mineral Specimen Images (D)

Donnayite-(Y): Sr3NaCaY(CO3)6·3(H2O)

Comments: Brown micro-crystals of donnayite-(Y) covering matrix.
Location: Mont. St. Hilaire, Rouville Co., Quebec, Canada. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Donpeacorite: (Mn,Mg)MgSi2O6  
Braunite-I: Mn++Mn+++6SiO12

Comments: Brown crystalline massive donpeacorite with dark brown black braunite.
Location: Zinc Corporation of America Mine #4, Balmat, Saint Lawrence County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Donpeacorite: (Mn,Mg)MgSi2O6  
Turneaureite: Ca5[(As,P)O4]3Cl  
Parvowinchite: Na(NaMn++)(Mg4Fe+++)Si8O22(OH)2

Comments: Colorless, transparent turneaureite masses with light brown tirodite (parvowinchite) and darker brown donpeacorite.
Location: 2500' level of the mine, ZCA Mine No. 4 (St Joe Mine; ZCA No. 4 mine), Balmat, Balmat-Edwards Zinc District, St Lawrence Co., New York, USA. Scale: Picture Size 0.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Dorfmanite: Na2(PO3OH)·2(H2O)

Comments: White cottony coatings of dorfmanite on matrix.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dorrite: Ca2Mg2Fe+++4(Al,Fe+++)4Si2O20

Comments: Dark brown micaceous dorrite (arrow) on matrix.
Location: Eicher, Sattel, Baden-Wurttemberg, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Douglasite: K2Fe++Cl4·2(H2O)

Comments: Small red-brown translucent grain of douglasite with white halite.
Location: Koningshutte, Silesia, Poland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dovyrenite: Ca6Zr[Si2O7]2(OH)4

Comments: BSE image of a large dovyrenite crystal in vesuvianite-foshagite skarn. Abbrev: dovyrenite (Dov), foshagite (Fsh), vesuvianite (Ves), calcite (Cal), (Mineralogia Polonica, v38: no 1, p18).
Location: Dovyren Bald Mountain (Ioko-Dovyren layered massif), Siberia, Russia.. Scale: See Image.
© Mineralogia Polonica

Dovyrenite: Ca6Zr[Si2O7]2(OH)4

Comments: Dovyrenite crystal with preserved orthorhombic prism {0kl}. Abbrev: dovyrenite (Dov), vesuvianite (Ves). (Mineralogia Polonica, v38: no 1, p19).
Location: Dovyren Bald Mountain (Ioko-Dovyren layered massif), Siberia, Russia.. Scale: See Image.
© Mineralogia Polonica

Doyleite: Al(OH)3  
Gibbsite: Al(OH)3

Comments: Botryoidal spheres of doyleite growing along with its dimorph gibbsite. Analysis shows that doyleite dominates the mix. There are also minor canary yellow phlogopite crystals.
Location: Baoshan, Yunnan, China. Scale: 8 x 6.5 x 1.9 cm.
© Fabre Minerals

Dravite: NaMg3Al6(BO3)3Si6O18(OH)4

Comments: Doubly terminated dravite crystal on white mica shist matrix.
Location: Yinnietharra Station, Gascoyne, Western Australia. Scale: 4 x 4 x 2.9 cm.
© Fabre Minerals

Dravite: NaMg3Al6(BO3)3Si6O18(OH)4

Comments: Greenish-brown chrome-rich dravite tourmaline crystals up to 13 mm long with complex terminations. Fluoresces mildly under UV illumination.
Location: Shako Ranch, Mwatate Kabanga, Voi, Taita-Taveta district, Coast Province, Kenya. Scale: 14x13x10 mm.
© John Betts - Fine Minerals

Dresserite: BaAl2(CO3)2(OH)4·(H2O)

Comments: Radiating spheres of dresserite on matrix.
Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dresserite: BaAl2(CO3)2(OH)4·(H2O)

Comments: White divergent sprays of fibrous crystals dresserite crystals.
Location: Francon quarry, Montréal, Jacques Cartier Co., Québec, Canada. Scale: Crystal size 5mm.
© Tom Loomis / Dakota Matrix

Drugmanite: Pb2(Fe+++,Al)H(PO4)2(OH)2

Comments: SEM view of a typical drugrnanite crystal.
Location: Found in silicified karst deposits, Richelle, 15 km north of Liege, Belgium. Scale: Picture Size 9 µm.
© Mineralogical Magazine

Drysdallite: Mo(Se,S)2

Comments: Metallic, black, submillimeter crystals of drysdallite approximatly 0.1 mm.
Location: Western Province, Zambia. Scale: Picthure Size 5 mm.
© Sandro Maggia/Minernet.it

Dufrenite: Fe++Fe+++4(PO4)3(OH)5·2(H2O)

Comments: Dark olive-greenish crystal of dufrenite on matrix.
Location: Rengersdorf, Görlitz, Oberlausitz, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Dufrenoysite: Pb2As2S5

Comments: Black prismatic crystal of Dufrenoysite with brassy yellow pyrite on succroidal dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Dufrenoysite: Pb2As2S5

Comments: Single, black dufrénoysite crystal in a vug in white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2.5 mm.
© Walter Gabriel

Duftite-alpha: PbCu(AsO4)(OH)  
Mimetite: Pb5(AsO4)3Cl

Comments: Mimetite crystals are replaced by Duftite-alpha on a gossanous matrix.
Location: Mt. Bonnie Mine, Northern Territory, Australia. Scale: Crystal size to 3mm.
© John Veevaert

Duftite-beta: PbCu(AsO4)(OH)

Comments: Intensely green Duftite-beta on fluorescent calcite.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: .
© Fabre Minerals