Howardites are achondritic stony meteorites that originate from the surface of the asteroid 4 Vesta, and as such are part of the HED meteorite clan. [1][2] There are about 200 distinct members known. [3] They are a regolith breccia consisting mostly of eucrite and diogenite fragments, although carbonaceous chondrules and impact melt can also occur.

古铜钙长无球粒陨石(howardite)、 钙长辉长无球粒陨石(eucrite) 和紫苏辉石无球粒陨石(diogenite) 合称HED无球粒陨石(取三个英文名称的第一- 个字母的缩写)，它们是来自第四号小行星一 灶神星 的样品， 已经在2011年被美国“黎明”号太空飞船的探测结果证实了。

2011年1月13日 · Howardites are polymict breccias that consist of a mechanical mixture of eucritic and diogenitic materials, formed in the same way as minerals in eucrites and diogenites, often containing carbonaceous chondrite clasts resulting from low-velocity impacts on the HED parent body. You might find these chapters and articles relevant to this topic.

2016年5月25日 · Howardites-Eucrites-Diogenites (HED)族陨石是地球上发现数量最多的无球粒陨石类型，也是太阳系中除地球岩石之外数量最多的岩浆岩样品。 它们的总质量超过了月球陨石和月球样品总和 (据国际陨石数据库统计)，HED族陨石累计发现达1555.8 kg，而月球陨石累计发现65.2 kg，月球样品382 kg (缪秉魁等，2013)。 HED族陨石与地球岩浆岩有着非常类似的物质组成和分类系统，但和地球岩浆岩不同，因为多数地球岩浆岩非常年轻，至今地球还有岩浆活动。

2015年6月1日 · The howardite, eucrite and diogenite (HED) clan of meteorites are ultramafic and mafic igneous rocks and impact-engendered fragmental debris derived from a thoroughly differentiated asteroid. Earth-based telescopic observation and data returned from vestan orbit by the Dawn spacecraft make a compelling case that the asteroid (4) Vesta is the ...

Classification: Achondrite (howardite) with three lithologies: 1) diogenite, 2) equilibrated cumulate eucrite, 3) equilibrated basaltic eucrite. Xenolithic CM2 clasts are present throughout. Low weathering grade, high shock stage.

Howardite also known as "Rattlesnake Jasper" and “Royal Flamingo Jasper” is a rare form of opalized/silicate volcanic tuff from northern Nevada. It is a very unique and beautiful red to brown brecciated jasper interspersed with clear agate and/or opal.

Howardites are an abundant group of polymict-breccia achondrites that appear to represent mixtures of eucrite s and diogenite s (these three linked groups are collectively known as HED meteorites and may come from asteroid 4 Vesta). The main minerals in howardites are pyroxene (largely orthopyroxene) and Na-poor plagioclase.

摘要 Howardite-Eucrite-Diogenite (HED)族陨石是地球上发现数量最多的无球粒陨石类型,也是太阳系中除地球岩石之外数量最多的岩浆岩样品。 本文对大量HED族陨石的岩石学和矿物化学特征进行了归纳总结,讨论... 展开更多 Howardite-Eucrite-Diogenite (HED)族陨石是地球上发现数量最多的无球粒陨石类型,也是太阳系中除地球岩石之外数量最多的岩浆岩样品。 本文对大量HED族陨石的岩石学和矿物化学特征进行了归纳总结,讨论了陨石的后期热变质作用和母体起源,对HED族陨石 …

2011年12月3日 · Rocks from Vesta — Part... These images are of HED (howardite, eucrite and diogenite) meteorites are a large group of meteorites believed to originate from asteroid Vesta, a hypothesis that is consistent with current Dawn observations.