halotrichite


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halotrichite

[ha′lä·trə‚kīt]
(mineralogy)
FeAl2(SO4)4·22H2O A mineral composed of hydrous sulfate of iron and aluminum. Also known as butter rock; feather alum; iron alum; mountain butter.
Any sulfate mineral resembling halotrichite in structure and habit.
References in periodicals archive ?
Pickeringite was identified by Bandy (1944) as a post-mining formation in old galleries, together with halotrichite.
The larger tabular marcasite crystals are sometimes coated with secondary minerals such as natrojarosite, rozenite and halotrichite, and tend to crack after a few years in a collection.
Associated minerals are: coskreaite-(Ce), levinsonite-(Y), melanterite, halotrichite, picketingite, apjohnite, epsomite and other hydrated sulfates.
Amazingly, Jones and Novak were able to salvage many of the specimens by teasing the halotrichite hairs up again with a comb and trimming them carefully with scissors.
Halotrichite forms silky white to yellowish fibrous masses and free-standing acicular crystals with no visible faces on terminations (Fig.
Fast-growing fibrous masses of pickeringite and halotrichite are common in many of the old workings at Cerro Rico.
1-mm lemon-yellow flakey crystals associated with other sulfates including halotrichite, melanterite, roemerite and voltaire.
They have grown in a pyrite-chlorite matrix with capillary white halotrichite and fibroferrite (?
Typical minerals formed under these conditions are water-soluble sulfates such as chalcanthite, melanterite and halotrichite, along with other more insoluble minerals such as malachite and chrysocolla.
Halotrichite occurs in an oxidized zone of the Brick 2 as minute, white, fibrous and acicular crystals.
Some joint surfaces of bleached and altered siltstone exposed at coordinates 19500N,22500E on the 5,075 bench locally exhibit thin coatings to 2 cm across of pale olive-green vanadiferous halotrichite.
Halotrichite was observed on a single specimen as radiating acicular tufts within a cavity in massive barite, associated with anatase.