Motukoreaite (5cm)
NaMg6Al3(SO4)2(OH)18.12H2O
Motukoreaite is the clear coloured clay-like interstitial cement.
Motukorea, Brown's Island, Waitemata Harbour, Auckland, New Zealand (Type locality)
Received from A. J. Read, DSIR, Petone, NZ, 1985
Photo and Coll. P. Perroud (now in NHM Geneva)