Talmessite from the Uriya deposit at the Kiura mining area, Oita Prefecture, Japan

Abstract

Talmessite was found in veinlets (approximately 1 mm wide) cutting into massive limonite in the oxidized zone of the Uriya deposit, Kiura mining area, Oita Prefecture, Japan. It occurs as aggregates of granular crystals up to 10 μm in diameter and as botryoidal aggregates up to 0.5 mm in diameter, in association with arseniosiderite, and aragonite. The talmessite is white to colorless, transparent, and has a vitreous luster. The unit -cell parameters refined from powder X -ray diffraction patterns are a

Yukonite and wallkilldellite–(Fe) from the Kiura mine, Oita Prefecture, Japan

“…The ore body is a skarn-type deposit formed by the intrusion of Late Miocene Okueyama granite into limestone and slates belonging to the Chichibu terrane. Various secondary arsenate minerals have been reported from the oxidized zone of this deposit (e.g., Ito and Shiga, 1932;Ito et al, 1954;Matsubara et al, 2009;Uehara et al, 2010;Ohnishi et al, 2013). The yukonite and wallkilldellite-(Fe) reported in this paper are also secondary arsenate minerals from the oxidized zone.…”

Crystal structure determination of karibibite, an Fe3+arsenite, using electron diffraction tomography

“…KARIBIBITE was discovered in a pegmatite in Namibia by von Knorring et al (1973), where it occurs as an alteration product of löllingite (FeAs 2 ), forming yellow crusts and sub-micrometre-thick fibres. While not abundant, it has been reported in several other places (Voloshin et al, 1989;Favreau and Dietrich, 2006;Kampf et al, 2013;Larsen, 2013;Ohnishi et al, 2013;Calvo, 2015) but never in crystals suitable for single-crystal X-ray studies. Its formula was given by von Knorring et al as Fe 3þ…”