Simultaneous dissolution of witherite and fluorite leads to some increase in fluoride concentrations in water, which is typical of the galenite-calcite-fluorite mineralization zone.
The comparison of the saturation indices of fluorite and witherite shows that both minerals are able to produce fluoride and barium into groundwater because of undersaturated states (Fig.
The Gilmores supplied the British Museum with fine specimens of witherite
, barite and fluorite which remain in the collection today.
from the Brownley Hill mine was first described by Thomson (1835) as forming "very large, six-sided prisms terminated by low six-sided pyramids." Crystals to 3 cm are sometimes seen on old-time specimens from the High Cross vein, whereas more recently found crystals from a brecciated, sulfide-rich vein at the base of the Great Limestone formation are pseudo-bipyramidal and up to 1 cm in size.
production since 1846 is estimated at 105,000 tons, ranking Fallowfield as the second largest producer of witherite
in the United Kingdom.
Mineralization consists primarily of galena with massive barite and accessory fluorite, witherite
, calcite and quartz.
Minerals listed by Alfors and Pabst (1984) from this prospect include sanbornite, fresnoite, krauskopfite, titantaramellite, barite, witherite
The Nentsberry Haggs mine, situated immediately northwest of the Brownley Hill mine and connected to it underground, produced exceptionally fine barytocalcite and witherite
as well as cabinet specimens of alstonite, barite, galena and sphalerite.
Trumbull Peak is one of several barium silicate occurrences located along the western margin of North America; it hosts such minerals as alforsite, celsian, gillespite, macdonaldite, pellyite, titantaramellite and witherite
, and is the type locality for sanbornite.
Naturally it's easy for anyone to enjoy simply looking at case after case of phenomenal fluorite, calcite, galena, sphalerite, witherite
, strontianite etc.
and barite also proved profitable, and thus the local mines were supported well into the 20th century.
There are 379 carbonates, 326 apatites and fluorites and 200 barites and witherites
. All of these are inexpensive, apart from two Bleiberg Lumachella stones at 7 and 15 Ecus.