 as well as the Kaolins, is found in commerce in the form of briquettes which are called pe-tun-tse." This word was for a time applied by mineralogists to a " fine, white vitrescible stone, compact and ponderous, and of considerable brightness when broken...  Theory of the Earth: With Proofs and Illustrations - Page 23by James Hutton - 1899 - 278 pagesFull view - About this book
 | John Williams - Mineralogy - 1810 - 570 pages
...informed, is composed of two different substances, called by them petuntse and kaolin. The petuntse is a fine white vitrescible stone, compact and ponderous, and of considerable brightness when broken. The kaolin is a fine white earthy substance, not vitrifiable, at least in the common heat of a potters... | |
 | John Williams - Mineralogy - 1810 - 590 pages
...informed, is composed of two different substances, called by them petuntse and kaolin. The petuntse is a fine white vitrescible stone, compact and ponderous, and of considerable brightness when broken. The kaolin is a fine white earthy substance, not verifiable, at least in the common heat of a potter's... | |
 | James Hutton - Earth - 1899 - 350 pages
...stated that " the fusible part of the paste is furnished by a rock of a petrosiliceous nature, whii li, as well as the Kaolins, is found in commerce in the...of considerable brightness when broken " (Williams, r without, or with few distinguishable spots. They are of various thicknesses, some of them 60 or 70... | |
| |
