Basanite (/ ˈ b æ s. ə ˌ n aɪ t /) is an igneous, volcanic rock with aphanitic to porphyritic texture. It is composed mostly of feldspathoids, pyroxenes, olivine, and calcic plagioclase and forms from magma low in silica and enriched in alkali metal oxides that …

2023年1月29日 · 碧玄岩 （英语： Basanite）是一种 火山 喷出岩，具有隐晶质到斑状纹理。 它主要由长石、辉石、橄榄石和斜长石组成，由含二氧化硅低且含碱金属氧化物高的岩浆，喷出地球表面迅速凝固形成。 碧玄岩是一种细晶质 火成岩，二氧化硅含量低，但富含碱金属。 根据QAPF分类图表，碧玄岩含似长石10% 至 60%，超过 90% 的 长石 是 斜长石。 缺失 石英。 这将碧玄岩置于 QAPF分类图表 的 玄武岩 / 碱玄岩 石区域中。 碧玄岩 与碱玄岩 之区别在于其标准 橄榄石 …

basanite, extrusive igneous rock that contains calcium-rich plagioclase feldspar (usually labradorite or bytownite), feldspathoid (usually nepheline or leucite), olivine, and pyroxene (titanaugite). Basanite grades into tephrite, which contains no olivine.

一种碱性玄武质岩石,由单斜辉石、斜长石、常见的副长石类和橄榄石斑晶组成的岩石。 按实际矿物成分在QAPF图解14区中确定。 按化学成分分类位于TAS图解U1区内。 按副长石成分可分为白榴碧玄岩、 霞石碧玄岩 、方沸碧玄岩等。 此名源于希腊语basanos,意为试金石。 [1] 碧玄岩，Basanite，Ne大于5%，Ol小于5%，也是SiO2明显不饱和及碱含量较高的富含似长石的碱性玄武岩。 主要矿物有基性斜长石、橄榄石、单斜辉石和似长石。

When normative albite exceeds 5 wt.%, rocks are classified as basanite, and when normative nepheline exceeds 20 wt.%, they are classified as nephelinite. Nevertheless, Martin Vaz Formation samples were classified as basanite and melanephelinite according to the CIPW norm ( …

2023年9月22日 · Basanite is a fine-grained, dark-colored volcanic or extrusive igneous rock. Fine-grained means its grains are too small to see without a microscope. Compositionally, basanite is a mafic rock with 45-52% silica. Its main minerals are calcic plagioclase, augite, nepheline, and olivine. Also, it has other minor minerals, including alkali feldspar.

basanite /ˈbæsəˌnaɪt/ 1.N a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone (旧时被用作试金石的)碧玄岩 [1]

Not to be confused with bassanite, the mineral, or basanite (chert), the black chert. Basanite appears in field 14 in the QAPF diagram. A family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...

生石膏 CaSO4·2 H2O 是 天然矿物，为白、浅黄、浅粉红至灰色的透明或半透明的板状或纤维状 晶体。 性脆，128℃失1.5H2O，163℃失2H2O。 工业上将生石膏加热到150℃脱水成熟石 …

Nepheline-basanite. Mafic (dark) igneous rock with aphanitic matrix and phenocrysts of green olivine and black pyroxene. Collection of Department of Geology, Faculty of Science, Palacký University in Olomouc, Czech Republic.