hollandite

hollandite

[′hä·lən‚dīt]
(mineralogy)
Ba(Mn2+,Mn4+)8O16 A silvery-gray to black mineral composed of manganate of barium and manganese; occurs as crystals.
References in periodicals archive ?
One example is hollandite that is dug out of the Italian Alps and shows promise for housing cesium.
Hollandite occurs rarely at Ilfeld as druses of tiny crystals in fissures in massive manganese ores, or encrusting barite (www.
Nsutite has been found, mixed with hollandite and other manganese oxide species, in a single Ilfeld specimen; tiny nsutite pseudomorphs after manganite crystals are discernible on the specimen (www.
Mineralogical composition of the fines at Balaghat and Ukwa mines is similar in nature and consists of Hollandite, Braunite, Psilomelane, Hematite, Apatite and Quartz.
French scientists summarize results from their research into hollandite, zirconolite, zirconolite-base glass-ceramics, and borosilicate glasses as matrices in which to store highly radioactive nuclear waste for a very long time.
The rarest specimens include scepters, crystals with moveable gas bubbles in fluid inclusions, fuschite inclusions, and star-shaped hollandite inclusions.
One sample gave an XRD pattern that is a fairly good match for hollandite.
A sub-district of this district is Animas-Chocaya district, Ferberite Aullagas See Colquechaca Avicaya Cassiterite, jarosite, stannite, vivianite Ayoreita Amethyst, hollandite, smoky quartz Berenguela Cassiterite, pyrite, pyrrhotite, silver sulfosalts Berenguela Apatite, greenockite, quartz, siderite, sphalerite.
Associated minerals are: braunite, quartz, the "violan" variety of diopside-aegirine-jadeite, strontiopiemontite, hollandite, cryptomelane, jadeite, antimony-bearing titanite and arsenic-bearing titanite and arsenic-bearing fluorapatite.
In the limonite orebodies of the Andrdssy I section, opaque, black, fibrous hollandite fills 0.
Relationship to other species: probably related to akaganeite and hollandite.
Short, silver-gray prisms of hollandite, the barium analog of cryptomelane, have been found associated with calcite at the 3-km point along the old Laurium-Kamareza road.