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Parwan lava caves, Bacchus Marsh, Victoria, Australia
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Latitude: 37°42'47"S
Longitude: 144°28'40"E
The Parwan Lava Cave system is situated on private property approx. 5 km southeast of Bacchus Marsh in western Victoria. The cave is a lava tunnel and has been known for about a century. The cave is made up of three elongated interconecting chambers, which run approx. E-W for about 150 m. The central chamber is the largest, with a maximum width of 20 m. The floor is about 8-9 m below the surface with a maximum ceiling height of about 3 m (2 m high average). The entrance is a 0.6 m diameter hole in a small depression near the crest of a low ridge. Phosphate mineralization occurs in only a few isolated patches and is the only indication that bats had been living in the cave. Small pockets of mineralization had occurred between some of the boulders on the floor of the central chamber, and were usually no bigger than 20 cm across and 10 cm thick. The main phosphate mineralisation occurred in the floor of the western chamber and was approx. 3 x 1.5 m. in area and up to 250 mm deep.

The Parwan Cave is the type locality for Parwanite (2007)

Mineral List

var: Carbonate-rich Fluorapatite

Parwanite (TL)

9 entries listed. 8 valid minerals. 1 type locality (valid mineral).

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Birch, W.D. & Henry, D.J., 1993, Phosphate Minerals of Victoria, The Mineralogical Society of Victoria, Special Publication No. 3

Willian D. Birch, Stuart J. Mills, Karolina Schwendtner, Allan Pring, John A. Webb, Ralph Segnit and John A. Watts (2007): "Parwanite: a new hydrated Na-Mg-Al-phosphate from a lava cave at Parwan, Victoria, Australia". Australian Journal of Mineralogy, 13, 23-30.

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