"' Tridymite "'is a high-temperature trillings " ( compound crystals comprising three twinned crystal components ).
12.
Powder diffraction can distinguish between minerals that may appear the same in a hand sample, for example quartz and its polymorphs tridymite and cristobalite.
13.
While trying to recover tridymite to fabricate new flight data circuit boards, the crew stumbles upon an underground military depository for advanced biological weapons.
14.
For example, in ?-quartz the bond length is 161 pm, whereas in ?-tridymite it ranges from 154 171 pm.
15.
Non-fibrous particulate materials that cause cancer include powdered metallic cobalt and nickel, and crystalline silica ( quartz, cristobalite, and tridymite ).
16.
The Si-O-Si angle also varies between a low value of 140?in ?-tridymite, up to 180?in ?-tridymite.
17.
The Si-O-Si angle also varies between a low value of 140?in ?-tridymite, up to 180?in ?-tridymite.
18.
Minerals formed by alteration processes include alunite, calcite, cristobalite, illite, jarosite, kaolinite, pyrophyllite, quartz, smectite, sulfur and tridymite.
19.
The Si-O-Si bond angle also varies from 140?in ?-tridymite to 144?in ?-quartz to 180?in ?-tridymite.
20.
The Si-O-Si bond angle also varies from 140?in ?-tridymite to 144?in ?-quartz to 180?in ?-tridymite.
