Ferrosaponite

ferrosaponite

mordenite

heulandite-Ca

stilvite-Ca

Images

Formula: Ca_0.3(Fe²⁺,Mg,Fe³⁺)₃(Si,Al)₄O₁₀(OH)₂.4H₂O
Phyllosilicate (sheet silicate), smectite group
Crystal system: Monoclinic
Specific gravity: 2.49 measured, 2.435 calculated
Hardness: 2
Streak: Green
Colour: Dark green colour gradually turning brownish by oxidation of Fe²⁺
Environments

Hydrothermal environments

Localities

At the type locality, the Levoberezhnoe Iceland spar deposit, Nizhnyaya Tunguska River Basin, Evenkiysky District, Krasnoyarsk Krai, Russia, ferrosaponite occurs as spherulites, up to 2 mm across, and as radial columnar aggregates within calcite. The type mineral is associated with calcite, pyrite, quartz, mordenite, heulandite-Ca and stilbite-Ca that form a hydrothermal assemblage at the deposit (AM 89.467).
Ferrosaponite from the Levoberezhnoe Iceland spar deposit - Image

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