一种新玉种—黄龙玉  

A new kind of jade:Huanglong jade

作　　者：刘学[1] 钱建平[1] 陈珊珊[1] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《矿产与地质》2013年第2期162-168,共7页Mineral Resources and Geology

摘　　要：黄龙玉矿床主要分布在云南省保山市龙陵县小黑山一带,矿体产于三叠系公养河群板岩与花岗岩接触带上。自古生代以来,除石炭纪、古近纪和新近纪外,其它地层均有出露。矿区岩浆活动频繁,具有多期次多阶段的岩浆侵入。黄龙玉的化学成分主要为SiO2,矿物成分为石英、玉髓和蛋白石,相对密度2.65～2.70,折射率1.54～1.56,Fe3+为致色离子,颜色成因以内源氧化转色为主,隐晶质—微粒结构,块状构造、条带状构造和角砾状构造。本文对黄龙玉产出的地质特征、宝石矿物学特征、品质特征以及与相似宝玉石—田黄和黄色翡翠对比等方面进行了深入阐述,为市场宝石的鉴别提供了一定的参考价值。The deposits of H uanglong jade are distributed in Xiaohei mountain area of Longling, Baoshan, Yunnan, China. The ore bodies occur on the slate-granite contact zone of Gongyanghe group of Triassic sys- tem. Since paleozoic era, outcropping occurs on other stratum except those in carboniferous, paleogene and neogene. The magmatic activities are frequent in this mining area, and the magmatic intrusion is multiperiodic and multistage. The chemical composition of Huanglong jade is mainly SiO2, and its mineral composition includes quartz, chalcedony and opal. The relative density is 2. 65-2.70g/cm3, the index of refraction is 1.54-1.56, the color causing ion is Fe3＋ , main cause of color is endogenous oxidation, and it has crypto-crystalline-microgranular texture, massive structure, banded structure and brecciated structures. This paper elaborates on geological characteristics, gemmological characteristics and quality characteristics of Huan- glong jade, and compares with similar gem and jade （tianhuang stone and yellow jade）. The findings possess a certain reference value to gem identification in the market.

关 键 词：黄龙玉 地质特征 矿物学特征 宝石品级 田黄 翡翠 

分 类 号：P619.283[天文地球—矿床学]