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Angrite钛辉无球粒陨石-Dorbigny

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发表于 2020-3-13 18:01:14 | 显示全部楼层 |阅读模式
D'Orbigny名字,是最大的一块angrite陨石,16.55kg。
钛辉无球粒陨石,是极其稀少的无球粒陨石,当前的价值甚至不低于月球和火星。
密度一般大于3.2,内部还存有2.3厘米直径的晶洞,还有少量的厘米大小的橄榄石晶体颗粒。

D'Orbigny
Buenos Aires, Argentina
Found 1979 July
Angrite
A 16.55 kg stone, mostly covered with dark gray fusion crust, was found in a corn field after a farmer hit it with a plow.  Classification and mineralogy (F. Brandstätter and G. Kurat, NHMV): has a sub-ophitic texture, exhibiting laths of plagioclase (An>99, up to 2 mm) with subhedral to euhedral augite and anhedral to subhedral olivine; augite shows marked optical zoning, with cores containing 1.6 wt% TiO2, 7.8 wt% Al2O3, XMg [Mg/(Mg + Fe + Ca)] = 26.8 mol%, XFe = 21.9 mol%, and XCa = 51.2 mol%, and reddish-brown rims with 4.0 wt% TiO2, 8.0 wt% Al2O3, XMg = 0.6 mol%, XFe = 46.7 mol%, and XCa = 52.6 mol%; olivine is zoned, with cores having Fa39.7La1.3 (La = larnite), 0.9 wt% CaO, 0.13 wt% Cr2O3, 0.45 wt% MnO, and rims having Fa75.9La11.5, 6.6 wt% CaO, 0.12 wt% Cr2O3, 0.93 wt% MnO; in places, anhedral kirschsteinite (Fa62.0La34.0, 20.0 wt% CaO, 0.11 wt% Cr2O3, 0.75 wt% MnO) is intergrown with olivine; in places, abundant ultrabasic glass fills pore spaces (SiO2 ≈40 wt%); minor to accessory phases include transparent brownish spinel (up to 500 μm), ulvöspinel, troilite, and a silicophosphate; contains abundant round vugs, up to 2.3 cm in diameter, and druses containing augite and rare centimeter-sized green olivine crystals (Fa9–11); rock is fresh, but pores contain variable amounts of caliche. Specimens: main mass with finder; type specimen, 184 g, NHMV.

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dorbigny_heavenlybodies.jpg dorbigny_monnigmuseum.jpg 7714_22346_2639.jpg

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参与人数 1金钱 +70 收起 理由
青藏大卫 + 70 精彩主题,感谢分享。

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发表于 2020-3-13 18:14:55 | 显示全部楼层
感谢资料分享,楼主辛苦了!
发表于 2020-3-14 10:12:03 | 显示全部楼层
楼主辛苦
感谢分享
发表于 2020-3-14 13:15:55 | 显示全部楼层
谢谢分享,学习了
发表于 2020-8-6 16:47:16 | 显示全部楼层
学习了,说真的,如果没有官方的认可,这东西我一看就丢了。
发表于 2020-8-7 15:06:44 | 显示全部楼层
学习
发表于 2020-8-7 16:00:02 | 显示全部楼层
漂亮,分享。
发表于 2020-8-11 16:56:07 | 显示全部楼层
这样的我也有
 楼主| 发表于 2020-8-24 10:27:09 | 显示全部楼层

很多是表面相似,本质完全不同啊。你的那个的密度是多少的?
发表于 2020-9-3 19:07:02 | 显示全部楼层
阿根廷农民犁地犁出来的,深灰色的融壳。感觉一捏就碎了,颠覆了对陨石的认识。
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