In this article, the "black jade "is studied, and it is found out that the main composition is dark green hornblende, so the jade must not be named "ink" jade but hornblende jade.

Chemical composition of hornblende and magnetite in the surface sediments in the east of the South China Sea is studied by means of the electron microprobe analyses and crystallochemistry-genesis illustration.

In this study, Ar-Ar isotope dating of muscovite, hornblende and phlogopite was carried out in order to con.

To gain a better understanding of the age of gold mineralization and its relationship with the evolution of the ductile shear zone,40Ar/39Ar plateau age analysis was made on biotitefrom biotite-quartz gneiss and on hornblende from biotite-hornblende mylonite.

Based on the characteristics of hornblendes, we classified the alkali granitoids as two types.

Crystallographic preferred orientation of amphibole in retrograded eclogites;

On the basis of petrography and mineral chemistry of the xenoliths,the amphiboles in them can be subdivided into four kinds of occurrences,i.

As one of major mineral phases in the intermediate-mafic intrusions in Southern Taihang Mountains, amphibole can be used to constrain its petrogenesis.

The ZBJ hornblende,as K-Ar age geostandard of China,was sampled from the Fangshan granodiorite in southwestern Beijing.

The hornblendite in Danailingou, with clear cryptoexplosion brecciated structure and mi-crolitic texture, occurs within Jurassic intermediate to acid volcanic rocks in a vein shape.

This paper chooses the Yaogou hornblendite body, one of the two major ultramafic outcrops in the Laiyuan batholith, as a representative to carry out detailed research.