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砷铜矾（Ｐａｒｎａｕｉｔｅ）在１９７８年首次发现于美国，１９８４年笔者在广西德保矿区也发现了这种矿物。笔者发现的这种矿物有两种形态，即纤维状和薄片状。纤维状砷铜矾的化学成分为（％）：ＣｕＯ５８．６９，Ａｓ２Ｏ５１７．４１，ＳＯ３６．５４，ＦｅＯ０．８６，ＳｉＯ２０．０８，（Ｈ２Ｏ１７．７０），其理想分子式为：Ｃｕ９（ＡｓＯ４）２（ＳＯ４）（ＯＨ）１０·７Ｈ２Ｏ，与美国产出的砷铜矾的化学成分基本一致。而薄片状砷铜矾的化学成分为（％）：ＣｕＯ５６．０９，Ａｓ２Ｏ５１８．３９，Ａｌ２Ｏ３０．２１，ＦｅＯ０．４０，ＳｉＯ２０．５６，ＳＯ３５．２０，ＣＯ２３．８３，Ｈ２Ｏ＋１４．４０，总量为９９．０８，其理想矿物分子式为：Ｃｕ９（ＡｓＯ４）２（ＳＯ４）（ＣＯ３）（ＯＨ）８·６Ｈ２Ｏ，这与美国所产出的砷铜矾有一定的差别。该矿物呈翠绿色至灰绿色，透明，玻璃光泽或珍珠光泽，硬度Ｈ＝２。薄片状砷铜矾的实测比重Ｄｍ＝３．３３，计算比重Ｄｃ＝３．３５，二轴晶负光性，Ｎｐ＝１．７０９，Ｎｍ＝１．７３２，Ｎｇ＝１．７３８，２Ｖ＝５４．６３°。纤维状砷铜矾的Ｘ射线粉晶衍射数据与美国砷铜矾基本一致。薄片状砷铜矾的主要衍射强线为１４．８５?
Parnauite was first discovered in the United States in 1978 and was discovered in 1984 by the author in the Debao mining area of Guangxi. I found this mineral has two forms, namely, fibrous and flaky. The chemical composition of fibrous arsenic and copper alum is CuO58.69, As2O517.41, SO36.54, FeO0.86, SiO20.08, (H2O17.70), and its ideal formula is Cu9 (AsO4) 2 SO4) (OH) 10 · 7H2O, and the chemical composition of the United States produced arsenic copper alum basically the same. The chemical composition of flaky arsenic cuprous alum (%): CuO56.09, As2O518.39, Al2O30.21, FeO0.40, SiO20.56, SO35.20, CO23.83, H2O + 14.40, the total amount of 99 .08, the ideal mineral formula is: Cu9 (AsO4) 2 (SO4) (CO3) (OH) 8 · 6H2O, which is different from the arsenic copper produced in the United States. The mineral was emerald green to gray green, transparent, shiny glass or pearl luster, hardness H = 2. The measured specific gravity of flaky arsenic-copper alum is Dm = 3.33, the specific gravity Dc is calculated to be 3.35, the biaxial crystallinity is negative, Np = 1.709, Nm = 1.732, Ng = 1.738, 2V = 54 .63 °. The X-ray powder diffraction data of fibrous arsenic copper and alum are basically the same as that of the U.S. arsenic copper alum. The main diffracting arsenic of flaky arsenic is 14.85?