The shift towards the S[O.sub.4] corner showed by other samples is due to the dissolution of more soluble sulfates as epsomite
(P1) and [Na.sub.2]S[O.sub.4]-bearing salts (P2, P3).
Using current technology on ground-based telescopes, Brown and Hand have identified a spectroscopic feature on Europa's surface that indicates the presence of a magnesium sulfate salt, a mineral called epsomite
, that could only originate from the ocean below.
After a few days some crystals had indeed appeared, but they were obviously not orthorhombic epsomite
Figure 4 shows specimens of deteriorated epsomite
that probably should have been removed long ago.
fibers occur on melanterite and chalcanthite stalactites.
Admixtures of alunogen and epsomite
are reported, with no details (Eckel, 1997).
Associated minerals are: coskrenite-(Ce), zugshunstite-(Ce), melanterite, halotrichite, pickeringite, apjohnite, epsomite
and other hydrated sulfates.
Associated minerals are: epsomite
, members of the "hair salt" family (the most abundant of which is apjohnite), gypsum, jarosite, tschermigite, diadochite and four other new species: levinsonite-(Y), zugshunstite-(Ce), the probable ammonium analogue of slavikite and an iron phosphate.
A relatively rare secondary mineral, botryogen occurs as thin, orange-yellow crusts up to several square centimeters in area in the Andrassy III section, associated with epsomite
, melanterite and copiapite (Szakall et al., 1997).
Species confirmed by X-ray diffraction during this study include alstonite, anglesite, ankerite, aragonite, barytocalcite, barite, brochantite, epsomite
, harmotome, hydromagnesite, jarosite, marcasite, melanterite, millerite, serpierite, siderite, sulfur and witherite.
Alum Cave Bluff, a Dana locality for apjohnite, epsomite
, melanterite and potash alum, has yielded good microcrystals of several rare sulfate minerals, including three new rare-earth sulfates, and is the first North American occurrence of slavikite.
was found by the writer as densely packed acicular crystals up to 5 mm in length coating shales in the Victory mines.