推荐回答（1个）
Trigonal system.Crystalforms are varied,being usually prismatic,ta bular and lamellar.Drusy,tabular,lamellar,granular,massive,stalactitic and oolitic aggregates.Colorless,white or varicolored by the staining of impurities.Vitreous luster,transparent to translucent.Three sets of perfect cleavage.HM2.5～3.75,ρ2.6～2.9g/cm3.Widely distributed in three classes of rocks,and is also formed either by hydrothermal or by weathering processes.The lamellar variety in parallel groups is called argentine.The colorless and transparent variety is called Iceland spar（表6.18；图6.66至图6.68）.
我国湖南石门出产的方解石最为有名。世界上最著名的方解石产地是冰岛，冰洲石英文名Icelandspar因此而得，该区的透明方解石单晶最大在6 m以上，但其他方面的观赏性并不出色。另外美国亚利桑那州、密歇根州等，英国昆布兰（Kumberland）、墨西哥齐瓦瓦及扎伊尔等也有优质方解石产出。
6.6.4.3 孔雀石（Malachite）
Monoclinic system.Prismatic and acicular crystals,but more common are acicular,fibrous,reniform,stalactitic,botryoidal and crustiform aggregates.Light green to dark green in color.Vitreous luster,with silky luster for fibrous variety.HM3.5～4,ρ4～4.5g/cm3.Occurs in oxidized zone of copper deposits（表6.19；图6.69，图6.70）.
广东省阳春县石碌铜矿中的孔雀石储量居全国第一，湖北铜录山也是国内著名的孔雀石产地。国际上最著名的孔雀石产地是美国亚利桑那州柯芒斯县比斯比铜矿（Bisbee），孔雀石色艳形美，长达7～8 cm，有时与蓝铜矿共生，有时呈蓝铜矿的假象。另外俄罗斯、法国、墨西哥、赞比亚、津巴布韦、刚果、纳米比亚、智利、澳大利亚等也是孔雀石的重要产地。
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