Stilpnomelane

Stilpnomelane

Stilpnomelane is a mineral that occurs in low-greenschist-facies conditions and is part of a mineral assemblage that includes quartz, albite, chlorite, sericite, epidote, and actinolite. It is characterized by elongated crystals that occur along magnetite boundaries and is often associated with actinolite and chlorite.From: Central America, Two Volume Set [2019], Rocky relationships: the petroglyphs of the Murujuga (Burrup Peninsula and Dampier Archipelago) in Western Australia [2019]

Iron ore beneficiation in the USA: Past and future

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Purchase Book

Published in Gülhan Özbayoğlu, Çetin Hoşten, M. Ümit Atalay, Cahit Hiçyılmaz, A. İhsan Arol, Mineral Processing on the Verge of the 21st Century, 2017

I. Iwasaki

stilpnomelane (K,Na,Ca)0~1(Fe,Mg,Al)7~8Si8O23~242~4H2O

A review of the occurrence of and potential for jade in the New Guinea Mobile Belt

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Journal Information

Published in Australian Journal of Earth Sciences, 2022

I. D. Lindley, P. J. S. White

Nephrite is reported from the Kumusi River, east of Kokoda (locality i, Figure 1 and Table 1; H. L. Davies, pers. comm., 2009). Davies collected what he thought was nephrite ‘from near the Kumusi River upstream from where the bridge is/was’. The bridge crossing is at Grid Reference 076153 Kokoda 1:100 000 Sheet (Datum: AGD66). He described the nephrite occurring in ultramafic rocks, perhaps originating from shearing and alteration of pyroxenite, but the observation was not mentioned in any of Davies’ reports. The Davies locality is ∼23 km east of Worthing’s (1988) Kokoda study area. At Kokoda, float boulders derived from the Emo Metamorphics contain a blueschist assemblage of quartz–albite–stilpnomelane–ferroglaucophane (Worthing, 1988). Blueschist rocks have also been recorded in the upper Aibale Valley, northwest of Kokoda (locality h, Figure 1 and Table 1). These rocks are minor and localised, and consist of quartz–muscovite–lawsonite–glaucophane in metabasites of the Kagi Metamorphics (Davies & Williamson, 1998). There is little serpentinisation at this locality. There are no known stone quarries at any of these three localities.

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Iron ore beneficiation in the USA: Past and future

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