Mineral Specimen Images (D)

Davyne: Na4K2Ca2Si6Al6O24(SO4)Cl2

Comments: Yellow translucent micro crystal of davyne in sanidine.
Location: Laacher See, Rheinland-Pfalz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dawsonite: NaAl(CO3)(OH)2

Comments: White, radial crystalline aggregates of dawsonite crystals.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Deanesmithite: Hg+2Hg++3Cr++++++O5S2

Comments: SEM image showing several crystals of deanesmithite protruding from matrix. (CanMin v31:787).
Location: Small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, Califomia, USA. Scale: Scale Bar 40 µm.
© Canadian Mineralogist

Decrespignyite-(Y): (Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O)

Comments: Blue, rounded aggregates of decrespignyite-(Y) on matrix.
Location: Paratoo copper mine, Yunta, Olary Province, South Australia, Australia. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Deerite: (Fe++,Mn)6(Fe+++,Al)3Si6O20(OH)5

Comments: Black bladed deerite crystals embedded in quartz and fibrous riebeckite.
Location: Laytonville quarry, Laytonville, Mendocino County, California, USA. Scale: See Image.
© Rruff Database

Defernite: Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)  
Hematite: Fe2O3

Comments: Specular hematite rich with crystalline grains of reddish brown defernite.
Location: Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia. Scale: 3.9 x 2.5 cm.
© John Veevaert

Defernite: Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)  
Vaterite: CaCO3  
Manganite: MnO(OH)

Comments: Opaque white fibrous vaterite with red defernite and black manganite.
Location: Kombat Mine, Otavi, Otjozondjupa, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Delafossite: Cu+Fe+++O2

Comments: Black crystals of delafossite on matrix.
Location: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Delhayelite: (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O)

Comments: Gray to creamy delhayelite crystal in matrix.
Location: Mt. Rasvumchorr, Chibiny, Kola, Russia. Scale: Specimen Size 2.5x5 cm.
© Diederik Visser

Deliensite: Fe++(UO2)2(SO4)2(OH)2·3(H2O)

Comments: Specimen is covered with abundant micro crystals of deliensite.
Location: Mas d'Alary Village, Le Bosc Lodeve, Herault, France. Scale: Not Given.
© John Veevaert

Delindeite: Ba2(Na,K,[ ])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2

Comments: pale pink acicular crystal sprays of delindeite on matrix.
Location: Diamond Jo Quarry, Hot Spring County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dellaite: Ca6Si3O11(OH)2  
Rustumite: Ca10(Si2O7)2(SiO4)Cl2(OH)2

Comments: White grains of dellaite, intermixed with rustumite.
Location: Queretaro, Zacatecas, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dellaventuraite: NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2  
Aegirine-augite: (Ca,Na)(Mg,Fe++,Fe+++)[Si2O6]

Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Scale: Picture size 2.5 cm.
© American Mineralogist

Deloneite-(Ce): NaCa2SrCe(PO4)3F

Comments: Pale yellow deloneite-(Ce) in matrix.
Location: Koashva Mt., Chibiny, Kola, Russia. Scale: Specimen Size 1.5x2.5 cm.
© Diederik Visser

Delrioite: CaSrV2O6(OH)2·3(H2O)  
Metadelrioite: CaSrV2O6(OH)2·(H2O)

Comments: Yellow metadelrioite and delrioite, with orange rossite/metarossite on a sandstone matrix. See inset image.
Location: Jo Dandy Mine, Montrose CO., USA. Scale: 6 1/4" x 5 1/2".
© Chris Wright / Wrights Rock Shop

Delvauxite: CaFe+++4(PO4,SO4)2(OH)8·4-6(H2O) (?)

Comments: Pure botryoidal massive delvauxite.
Location: Kutna Hora, Stredocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Demartinite: K2[SiF6]

Comments: SEM image of a tapering, hexagonal demartinite crystal. (CanMin, v45:1275).
Location: La Fossa crater, Vulcano, Eolian Islands, Italy.. Scale: See Image.
© Canadian Mineralogist

Demesmaekerite: Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)  
Malachite: Cu2(CO3)(OH)2

Comments: Pale green crystals of demesmaekerite on dark green malachite.
Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Crystal Size 3mm.
© John Veevaert

Demesmaekerite: Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)

Comments: Tabular, light green and spear-shaped dark greenish brown demesmaekerite crystals.
Location: Musonoi mine, Kolwezi, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 3 mm.
© Paul M. Schumacher

Demicheleite-(Br): BiSBr

Comments: (SEM) image (BSE) of demicheleite. (AmMin, v93:1603).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy. Scale: See Image.
© American Mineralogist