的意义是什么缩写的下标一些矿物质吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 10 - t20:53:44z //www.hoelymoley.com/feeds/question/18797 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/18797 3 的意义是什么缩写的下标一些矿物质吗? URIZEN //www.hoelymoley.com/users/18551 2019 - 12 - 26 - t00:13:34z 2019 - 12 - 26 - t19:09:00z < p >我已经注意到,在许多文章矿物质,我读过一些矿物数字下标的缩写,例如,发生与镁橄榄石(Fo <子> 95 - 90 < /订阅>,Fo <子> 92 - 84 < /订阅>,Fo <子> 94 < /订阅>,等等)。这个下标的意思是什么? < / p > //www.hoelymoley.com/questions/18797/-/18799 # 18799 4 回答的让-玛丽•Prival下标是什么意思的一些矿物质的缩写吗? 让-玛丽•Prival //www.hoelymoley.com/users/18081 2019 - 12 - 26 - t08:25:00z 2019 - 12 - 26 - t19:09:00z < p >橄榄石是一种< a href = " https://en.wikipedia.org/wiki/Solid_solution " rel = " nofollow noreferrer " >固溶体< / >镁橄榄石和铁橄榄石之间,所以它通常表示为摩尔百分比这些包体,例如Fo <子> 80 < /订阅> Fa <子> 20 < /订阅>。通常只有一个包提到,因为它足以推断其他(它们的和总是100%)。< / p >

It is the same with plagioclase, which is a solid solution between albite and anorthite and is often expressed as "Abxx" or "Anxx", where xx is the molar percentage of considered end-member.

Edit: As for the range, e.g. 95-90, I'd say they analyzed several olivine grains in the same sample, and the range represents the variability of compositions they found. It could also be the analytical error on a single composition, but I doubt it would be that large, although it could be in some old papers when the precision of chemical analyses was not as good as today.

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