amesite

amesite

[′ām‚zīt]
(mineralogy)
(Mg,Fe)4 A14Si2O10(OH)8 An apple-green phyllosilicate mineral occurring in foliated hexagonal plates.
References in periodicals archive ?
2001) showed a strong scatter when those with pyrophyllite component in potassic white mica and amesite component in chlorite (see equilibria 1 and 2) were considered.
5 350 Equilibria E1 6 Mg-Al-celadonite + 1 amesite = 2 clinochlore + 6 K-feldspar + 2 quartz + 2 H2O E2 4 Mg-Al-celadonite + 2 muscovite = 6 K-feldspar + 1 amesite + 2 quartz + 2 H2O E3 5 Mg-Al-celadonite + 1 muscovite = 1 clinochlore + 6 K-feldspar + 2 quartz + 2 H2O E4 3 Mg-Al-celadonite = 1 phlogopite + 2 K-feldspar + 3 quartz + 2 H2O IP1 intersection of 6 equilibria with the subsequent participating mineral components: Mg-Al-celadonite, muscovite, phlogopite, clinochlore, K-feldspar, quartz, H2O
For a few years now we have been seeing scattered specimens with carpets of purple amesite crystals coating seam linings in massive black chromite, and brilliant crystals of deep green chromian titanite, in some cases resting lightly on the amesite carpets, from the Saranovskoe chromium mine in the Middle Urals of Russia.
Mineralogists of the 19th century were much more successful in the description of new layer hydrosilicates: allophane, amesite, antigorite, aspidolite, batavite, biotite /a series name/, celadonite, chamosite, chrysotile /a series name/, clinochlore, corundophyllite, cronstedtite, delessite, diabantite, ephesite, glauconite /a series name/, halloysite, kaolinite, muscovite, nacrite /a polytype/, nontronite, palygorskite, paragonite, penninite /or pennine/, phengite /a series name/, phlogopite, polylithionite, pyrophyllite, ripidolite, roscoelite, saponite, sauconite, sepiolite, serpentine, siderophyllite, stevensite, tainiolite, thuringite, vermiculite /trioctahedral and dioctahedral, distinguished in the 20th century/, volkonskoite, zinnwaldite /a series name/.
Most interesting, and not so beauty-challenged after all, were a few cabinet-sized matrix specimens with glistening pale purple coverages of chromian amesite crystals, from the Saranoskii mine in the Urals.
Additionally, bright lilac to purple chromian amesite crystals (to 4 mm) were available in nearly pure groups (to several cm), sometimes with associated titanite or clinochlore.
93-042 A regular interstratification of amesite and clinochlore Monoclinic: Cm a 5.