Richelsdorfite from the type locality
14th Nov 2017 16:28 UTCReiner Mielke Expert
Quite usual thing. I always supposed, that "sanbornite quartzites" are composed by sanbornite and quartz. :-)))
Recently I received some samples from Esquire #8 claim and decide to check fresnoite from them. As result the main constituents of the white matrix rock turned out diopside (about 60-70 wol.%) with minor celsian and witherite and very minor sanbornite (may be 1-2 wol.% of 300 g sample).
Central bright fresnoite crystal is surrounded here by two medium bright celsian plates (left-right) and two dark diopside xls (top-bottom) with minor particles of brightmost witherite.
This diopside contains Fe (4.2 mas.% FeO) and Mn (2.2 mas.% MnO) but still is snow-white.
All must to be checked.
Recently I received some samples from Esquire #8 claim and decide to check fresnoite from them. As result the main constituents of the white matrix rock turned out diopside (about 60-70 wol.%) with minor celsian and witherite and very minor sanbornite (may be 1-2 wol.% of 300 g sample).
Central bright fresnoite crystal is surrounded here by two medium bright celsian plates (left-right) and two dark diopside xls (top-bottom) with minor particles of brightmost witherite.
This diopside contains Fe (4.2 mas.% FeO) and Mn (2.2 mas.% MnO) but still is snow-white.
All must to be checked.
These lemon-yellow narsarsukite-like grains are fresnoite within diopside-celsian matrix.
This is view of whole specimen. Its the right part is composed by compact walstromite layer (with positive relief, some more white). Minor micaceous sanbornite flakes are visible along the upper edge of the sample (especially at right end).
