Within these structures prehnite is found as botryoidal coatings, isolated spheres and thick carpets composed of prehnite pseudomorphs after glauberite and anhydrite
. The color, shape and luster of the prehnite can vary greatly between the pockets.
FlexiDry fast drying floor screeds come in a range of drying time from 3 days to 21 days, allowing construction projects to resume without the long delays that normal anhydrite
He won the seat in 1983, and one of his first campaigns was to fight plans to store nuclear waste in the former anhydrite
mines underneath Billingham.
HFU1: Shaly limestone and shaly dolostone with anhydrite
The geologist knows calcium sulphate as anhydrite
. Its monoclinic crystal lattice and flower-like clumps of needles are also the most common form in nature, and it is from rocks bearing anhydrite
that water derives its hardness.
In its lower 3 m, the Eel Bed contains 1-3 cm structureless and vuggy beds intercalated with thinly-laminated (1-5 mm) layers of algal mats, anhydrite
Sulphate minerals are limited to gypsum and small amounts of anhydrite
(XRD), although some celestite was also observed in the petrographic examinations.
The content of six main components: lime CaO, anhydrite
CaS[O.aub.4], quartz Si[O.sub.2], calcite CaC[O.sub.3], periclase MgO and larnite [Ca.sub.2]Si[O.sub.4] was determined.
At that site, much hotter fluids (350[degrees]C) jetted from tall rock formations composed of calcium sulfate (anhydrite
) and metal sulfides.
The unit is recognized as a formation, the Bass Islands Dolomite, in the subsurface, where it is defined as the interval suprajacent to the uppermost anhydrite
of the G unit of the Salina and subjacent to the Silurian-Devonian unconformity.
Surface sampling recovered iron, copper and zinc sulphides along with anhydrite
, silica and other oxides.