Lesson plan
Xilingolite
Xilingolite is a lead sulfide mineral with formula Pb 3 Bi 2 S 6 . It has a hardness of 3, a metallic luster, and usually exhibits a lead-grey color. It is a dimorph of lillianite, exhibiting increased Pb-Bi order and decreased symmetry. Its crystal system is monoclinic, with three axes of unequal length two of which are at an oblique angle to each other while the third axis is perpendicular to the plane formed by the other two. Xilingolite is opaque, meaning that its internal structure does not allow for light to be transmitted through it. The mineral also exhibits white to blue-tinted-white pleochroism under reflected light.
Article summary
Xilingolite is a lead sulfide mineral with formula Pb 3 Bi 2 S 6 . It has a hardness of 3, a metallic luster, and usually exhibits a lead-grey color. It is a dimorph of lillianite, exhibiting increased Pb-Bi order and decreased symmetry. Its crystal system is monoclinic, with three axes of unequal length two of which are at an oblique angle to each other while the third axis is perpendicular to the plane formed by the other two. Xilingolite is opaque, meaning that its internal structure does not allow for light to be transmitted through it. The mineral also exhibits white to blue-tinted-white pleochroism under reflected light.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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