Flora Valley, Flora Valley Station, Halls Creek Shire, Western Australia, Australia
Amethyst, quartz and chalcedony in amygdales and geodes of the Cambrian Antrim Plateau Volcanics. Occasional specimens seen from the location, but information is lacking, especially about amethyst, and needs someone who has visited the location to update Mindat.
The Antrim Plateau Volcanics outcrops extensively across the east Kimberley, and extends into the Northern Territory covering at least
35 000 square kilometres. It is predominantly composed of tholeiitic basalt, to 1000 metres thickness, and has endured very little tectonic disturbances. The massive basalt lava flows contain brecciated flow tops, and can also contain sandstone, conglomerate, siltstone and chert.
The reference notes prehnite at Flora valley, but also mentions it is found widely over the east Kimberley and into the Northern Territory, Wave Hill being an example of the latter. It states many streams between Kununurra and Halls creek contain rounded, translucent colourless to pale green prehnite pebbles which have been weathered out of nearby rocks.
Again the reference states prehnite prospects are in remote country 80 kilometres north-east of Halls Creek, and 50 kilometres north-west of the homestead, but needs someone on the ground to confirm. Known as the Mound, New, and Flora Valley prospects. Prehnite occurs in amygdales or veins, and also is found as scattered nodules on the surface. Some specimens have been seen, but no serious mining has taken place.
| Prehnite|| Quartz|| Quartz|
4 entries listed. 2 valid minerals.
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Fetherston, J.M., Stocklmayer, S., Stocklmayer, V.C.(2013): Gemstones of Western Australia- mineral resources bulletin 25, Geological Survey of Western Australia (2013): 214
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Locality Updated: Challenge deposit, Emerald Lake Hills, San Mateo Co., California, USAFrom Brent Thorne, 7th Dec 2013 23:31:03