Lesson plan
Vanarsite
Vanarsite, NaCa 12 (As 3+ V 4+ 3.5 V 5+ 8.5 As 5+ 6 O 51 ) 2 ・78H 2 O, is a mineral that forms as very dark blue blades that are flattened on {100} and elongated on [010]. The crystals form in sub-parallel intergrowths in aggregates up to 5 mm long and are part of the cubic crystal system. The mineral is found in the Packrat mine in Colorado, USA in association with three mineral of similar composition, packratite, Ca 11 (As 3+ V 4+ 2 V 5+ 10 As 5+ 6 O 51 ) 2 ・83H 2 O, morrisonite, Ca 6 (As 3+ V 4+ 2 V 5+ 10 As 5+ 6 O 51 ) 2 ・78H 2 O, and gatewayite, Ca 11 (As 3+ V 4+ 3 V 5+ 9 As 5+ 6 O 51 )・31H 2 O. Vanarsite has been determined to be part of the vanadate, arsenite, and arsenate groups. Analytical methods were used to determine its chemical composition, physical properties, and structure.
Article summary
Vanarsite, NaCa 12 (As 3+ V 4+ 3.5 V 5+ 8.5 As 5+ 6 O 51 ) 2 ・78H 2 O, is a mineral that forms as very dark blue blades that are flattened on {100} and elongated on [010]. The crystals form in sub-parallel intergrowths in aggregates up to 5 mm long and are part of the cubic crystal system. The mineral is found in the Packrat mine in Colorado, USA in association with three mineral of similar composition, packratite, Ca 11 (As 3+ V 4+ 2 V 5+ 10 As 5+ 6 O 51 ) 2 ・83H 2 O, morrisonite, Ca 6 (As 3+ V 4+ 2 V 5+ 10 As 5+ 6 O 51 ) 2 ・78H 2 O, and gatewayite, Ca 11 (As 3+ V 4+ 3 V 5+ 9 As 5+ 6 O 51 )・31H 2 O. Vanarsite has been determined to be part of the vanadate, arsenite, and arsenate groups. Analytical methods were used to determine its chemical composition, physical properties, and structure.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
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- 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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