Mineral Specimen Images (D)

Dachiardite-Ca: (Ca,Na2,K2)5Al10Si38O96·25(H2O)

Comments: Milky bladed aggregates of dachiardite-Ca with mordenite-Na in cavities in basalt.
Location: Cape Lookout Quarry, Tillamook Co., Oregon, USA. Scale: Specimen Size 2.5x4 cm.
© Diederik Visser

Dachiardite-Na: (Na2,Ca,K2)4Al4Si20O48·13(H2O)

Comments: Orange flat radial crystals of dachiardite-Na to 2cm across on matrix.
Location: Alpe di Siusi, Bolzano, Trentino Alto Adige, Italy. Scale: Specimen size: 6x4x3cm.
© Tom Loomis / Dakota Matrix

Dadsonite: Pb21Sb23S55Cl

Comments: Gay metallic massive dadsonite.
Location: Wolfsberg, Harzgerode, Sachsen-Anhalt, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dalyite: K2ZrSi6O15  
Janhaugite: (Na,Ca)3(Mn++,Fe++)3(Ti++++,Zr,Nb)2Si4O15(OH,F,O)3

Comments: Tan crystalline dalyite (arrow) with reddish brown janhaugite.
Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Danalite: Fe++4Be3(SiO4)3S

Comments: Orange irregular gemmy danalite in matrix.
Location: Iron Mountain, Winston, New Mexico, USA. Scale: See Image.
© Rruff Database

Danburite: CaB2(SiO4)2

Comments: Very-fine, large, single transparent crystal of danburite with minor crystals of colorless calcite all around the base.
Location: Charcas, San Luis Potosi, Mexico. Scale: 4 x 2.5 x 9.5 cm.
© Dan Weinrich

Danielsite: (Cu,Ag)14HgS8

Comments: BSE image showing danielsite (D - light gray) and stromeyerite (S - slightly darker) occupy the center of the triangular area and are surrounded by chalcocite (C - black).The anglesite (A) is white.
Location: Pocket of primary sulfides in a quartz vein near Coppin Pool, Western Australia. (AmMin, v72:401). Scale: See Image.
© American Mineralogist

Daomanite: CuPtAsS2

Comments: Magnification of the micro-aggregate (shown in inset), which consists of white sperrylite, unnamed Cu2(Ni,Co)Pt3S8 and a single daomanite (Dmn) grain, and displays the chain-like morphology. (CanMin, v42:455).
Location: Chromitite layer of the Mount Bol’shaya Varaka deposit, Imandra layered complex, Kola Peninsula, Russia. Scale: See Image.
© Canadian Mineralogist

Daqingshanite-(Ce): (Sr,Ca,Ba)3(Ce,La)(PO4)(CO3)3-x(OH,F)x

Comments: B&W SEM image showing large grains of daqingshanite-(Ce) (light-grey) in carbonate matrix (dark-grey). Associated mineral is monazite-(Ce), which form small very bright grains, partialy replacing daqingshanite-(Ce).
Location: Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia. Scale: Scale Bar 500 µm.
© Pavel M. Kartashov

Darapskite: Na3(SO4)(NO3)·(H2O)

Comments: White crystalline granular darapskite.
Location: Iquique, Tarapaca, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dashkovaite: Mg(HCOO)2·2(H2O)

Comments: White fibrous dashkovaite.
Location: Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 2.3 mm.
© Thomas Witzke / Abraxas-Verlag

Datolite: CaBSiO4(OH)

Comments: Cluster of doubly-terminated datolite crystals to 3.3 cm across with a scattering of brown inclusions.
Location: Boron Pit, Dal'Negorsk, Russia. Scale: 5x3.9x3.7 cm.
© Fabre Minerals

Daubreeite: BiO(OH,Cl)

Comments: Massive yellow daubreeite.
Location: Cerro Tazna, Atocha-Quechisla district, Nor Chichas Province, Potosí Department, Bolivia. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Daubreelite: Fe++Cr2S4  
Alabandite: MnS

Comments: Daubreelite (D), bright metallic white, with alabandite (A) (dull yellow) as inclusions in a polished section of an achondrite meteorite.
Location: Norton County, Kansas. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Daubreelite: Fe++Cr2S4  
Schollhornite: Na0.3CrS2·(H2O)  
Caswellsilverite: NaCrS2

Comments: Polished section (PPL) of schiillhornite (Sh), coexisting with caswellsilverite (Cw), ferromagnesian alabandite (Ab) and daubreelite (Db). (AmMin, v70:638).
Location: Norton County (Kansas-Nebraska) enstatite achondrite meteorite. Scale: Scale bar is 0.08 mm.
© American Mineralogist

Davanite: K2TiSi6O15

Comments: B&W plane-polarized light (PPL) image of davanite crystals, with a hexagonal outline, in a Sr-Ca carbonate matrix. (AmMin, v71:1473).
Location: Lamproites at Smoky Butte, Montana, USA. Scale: Scale Bar 20 µm.
© American Mineralogist

Davidite-(Ce): (Ce,La)(Y,U)(Ti,Fe+++)20O38

Comments: Black, granular crystals of davidite-(Ce) in matrix.
Location: Kukisvumchorr Mt., Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 9x5x5 mm.
© Sergey Vasiliev / Systematic Mineralogy

Davidite-(La): (La,Ce,Ca)(Y,U)(Ti,Fe+++)20O38

Comments: Prismatic crystals of davidite in carbonatite.
Location: Thackering, South West Australia, Australia. Scale: Crystal size 2 cm.
© John Veevaert

Davisite: Ca(Sc,Ti+++,Mg,Ti++++)AlSiO6

Comments: BSE image of the davisite-containing refractory inclusion in a polished section (USNM 7555). (AmMin, v94:845).
Location: Allende meteorite. Scale: See Image.
© American Mineralogist

Davreuxite: MnAl6Si4O17(OH)2

Comments: Pale yellow fibrous davreuxite on quartz.
Location: Ottre, Luxembourg, Belgium. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species