Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal. The formula of the admixture of the three most common endmembers is written as Ca 10 ( PO 4 ) 6 (OH,F,Cl) 2 , and the crystal unit cell formulae of the ...

深灰色磷灰石（Dark grey apatite）是采集于前苏联 (The Former Soviet Union)的矿物标本。 [1] 深灰色，条痕：白色，玻璃光泽，断口油脂光泽，透明至半透明，粒状集合体，硬度：5，相对密度为：3.18-3.21，解理 {0001}不完全至中等， {1011}不完全。 [1] 用于制造磷酸、磷肥和各种磷盐，有的可用作激光、抗菌材料和宝石。 [1] 深灰色磷灰石（Dark grey apatite）是采集于前苏联 (The Former Soviet Union)的矿物标本。

The apatite crystal is very small and elongated. Its high relief allows it to stick out from the other colorless minerals. Under cross-polars apatite exhibits a first order gray color. Click on the image to see it in both plain and (rotated and magnified) in cross polarized light.

Apatite is named for the Greek word apate, which means "deceit", since Apatite is similar in appearance to many other minerals. Apatite describes a group of similar isomorphous hexagonal phosphate minerals. The primary Apatite group includes Fluorapatite, Chlorapatite, and Hydroxylapatite.

2024年11月15日 · Gray agate is a semi-translucent gray colored gemstone that contains microscopic quartz crystals. It usually features medium gray hues mixed with hints of blues and browns. It varies in clarity and features a curved angular texture and a layered appearance.

What is Apatite? Apatite belongs to a group of minerals called phosphorites. It is used as the index mineral for a hardness rating of five on the Mohs scale. It occurs in a wide variety of colors, including yellow, green, grey, blue, white, purple, brown, and violet.

Apatite, from the Greek "apatao" (to fool), resembles paraíba tourmaline, peridot, or beryl. Discover more on Juwelo's gemstone information.

Apatite is usually an accessory mineral in igneous and metamorphic rocks. This means it is present as small grains, sometimes as inclusions in other minerals (see below). Apatite can be distinctive because of its six side outline (if cut perpendicular to the c-axis) and low birefringence.

This Apatite gemstone guide lists qualities of the Apatite gem type, including stone colors, common names, meanings, gemstone hardness and more.

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