Assertion: tellurium | /r/AtLocation | nature
Facets:
value: sometimes
type: TEMPORAL
value: natively
type: DEGREE
Source sentences:
text: Tellurium occurs in nature in the form of eight stable isotopes, with mass numbers of 120, 122–26, 128, and 130; the most widespread are 128Te (31.79 percent) and 130Te (34.48 percent).
text: It can form nice crystals and sometimes natively occurs in nature, however it is very rare.