It is found in nature as the mineral valentinite
(rhombic) and senarmontite (octahedral).
The Mn-Fe carbonate during this stage recrystallized to different degree (Figures 4(f), 4(g) and 4(i)-4(k)), some even formed the druse containing the idiomorphic columnar quartz, needle-like boulangerite, or valentinite
A literature search failed to locate any report of monoclinic S[b.sub.2][O.sub.3]; however, an orthorhombic phase which bears the mineral name valentinite
is well known.
In the Keyue deposit, the ore minerals include sphalerite, galena, pyrite, arsenopyrite, chalcopyrite, tetrahedrite, freibergite, boulangerite, jamesonite, bournonite, and stibnite; the gangue minerals are mainly Mn-Fe carbonate, quartz, and calcite (Figures 4-6); and the supergenesis generates the minerals that prevailingly include ferrohydrite, sardinianite, valentinite
, malachite, and siliceous sinter (Figure 7).
All right--hidden away in a little white box at the stand of Jordi Fabre (www.fabreminerals.com) was a specimen of valentinite
, mined sometime around 1988 in the Tatasi mine, San Vicente, Chichas Sur, Potosi, Bolivia.
In the final, exogenic phase, stibnite was oxidized, giving rise to a series of antimony oxide minerals such as valentinite
Maiwan & other small mines) Xiangtan Hunan manganite Xiaojie Sichuan amazonite, quartz Xiaosongshan Ningxia diopside Xikuangshan Hunan barite, calcite, cervantite, fluorite, gypsum, pyrite, quartz, senarmontite, stibiconite, stibnite, sulfur, valentinite
Xinzai Yunnan cassiterite Xiongxiong' Guizhou hematite, "limonite," siderite ga Xixia Henan andalusite Xiyugou Liaoning antigorite, chlorite, chrysotile, lizardite, talc, tremolite Xuebaoding Sichuan apatite, aquamarine, cassiterite, (Hujia) dolomite, feldspar, fluorite, goshenite, morganite, muscovite, quartz, scheelite Yangliuping Sichuan bornite, chromium, *danbaite, gold, linnaeite, sperrylite, testiobiopallasite, violarite Yangshuo Guangxi, calcite, cerussite, pyromorphite Zhuang A.R.
Brian also had about 25 thumbnails and miniatures of massive gray galena matrix on which perch sharp, silky white, wedge-shaped crystals of valentinite
to 1.5 cm, found a year ago at the Colavi mine, Potosi.
Chinese antimony deposits of the Wuling type generally contain stibnite as the main ore mineral (with stibiconite and valentinite
in the oxidized zone), plus quartz, barite and calcite.
The excellent valentinite
crystals found at several Bolivian mines, and even the Lomitas mimetite and austinite, are hydrothermal rather than secondary oxides!
From the Colavi mine, Comelio Saavedra Province, Potosi Department, there are a few 3 to 5-cm metallic gray matrix specimens with small vugs containing sharp, wedge-shaped, glassy transparent crystals of valentinite
to 1 cm.
Associated minerals include cerussite, anglesite, realgar, barite, galena, mimetite, smithsonite, valentinite