Al-Free Gyrolite from the Lizard, Cornwall, England

N. J. Elton, J. J. Hooper and V. A. D. Holyer
Tregears, Little Treviscoe, St Austell, Cornwall PL26 7QL
48 St Julitta, Luxulyan, Bodmin, Cornwall PL30 5ED
The Cornerstone, 7 Tregonning Park, St Keverne, Helston, Cornwall TR12 6QT

Abstract: Gyrolite containing no detectable Al (<0.04 wt.%) has been found as aggregates of platey crystals to 6 mm at Dean Quarry, the Lizard, Cornwall. The gyrolite occurs embedded in calcite which fills a fracture vein in gabbro. Paragenetic evidence is inconclusive, but suggests that gyrolite formed relatively early, after prehnite, and possibly around the same time as analcime and natrolite.

Keywords: zeolite • gyrolite • Lizard • Cornwall

Mineralogical Magazine; April 1998 v. 62; no. 2; p. 271-272; DOI: 10.1180/002646198547521
© 1998, The Mineralogical Society
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