Gobbinsite occurs as fibrous crystal in the amygdales of altered trachybasalt from Kuniga, Dozen, Oki Islands, Shimane Prefecture, Japan. The average chemical composition by EDS analyses leads to the empirical formula, Na
4.09Ca
0.75K
0.23Sr
0.07Al
5.92Fe
0.01Si
10.07O
32·nH
2O on the basis of O=32 in anhydrous part. The unit cell parameters calculated from the X-ray powder diffraction data are
a=10.078(3),
b=9.785(2) and
c=10.149(3) Å. The correct X-ray powder diffraction data for gobbinsite as orthorhombic cell are indicated, because the previous X-ray powder diffraction data are confused in the point of the crystal system and cell parameters.
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