aphrosiderite

\\ˌafrōˈsidəˌrīt\ noun (-s)

Etymology: German aphrosiderit, from aphr- + siderit siderite

: a mineral consisting of a hydrous silicate of the chlorite group

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aphrosiderite Min.

(æfrəʊˈsɪdəraɪt)

[mod. (1847) f. Gr. ἀϕρό-ς foam + σίδηρ-ος iron + -ite.]

A soft ferruginous mineral of a dark olive-green colour, classed by Dana as a variety of Prochlorite.