| 释义 |
pumicite|ˈpʌmɪsaɪt|
[f. pumice n. + -ite1.]
A volcanic ash like pumice in composition but occuring as powder or granules.
1916E. H. Barbour in Nebraska Geol. Survey IV. 358 Pumicite has been variously called geyserite, volcanic dust,..and the like... For all of these we have substituted the name pumicite, a self-explanatory term, which we have used for some years. 1949J. A. Barr in Industrial Minerals & Rocks (ed. 2) xxxvi. 752 The principal use of pumicite is for concrete aggregate. 1965G. J. Williams Econ. Geol. N.Z. xvi. 245/2 Other deposits at Takanini and Hurua [read Hunua] have been quoted as a source of diatomaceous material for fibrolite and light-weight concrete but Ritchie pointed out that this is pumicite with no diatoms. 1974A. C. Tennissen Nature of Earth Materials vii. 394 Finely ground pumice and unground pumicite are used in general scouring powders... Other uses for unground pumicite and ground pumicite are..in insulation, as filter aids, as poultry litter, [etc.]. |