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这个几乎纯的膨润土矿床是在意大利撒丁西北部 S′Aliderru 进行钻探时发现的。该矿山业已开采,它是欧洲最大的矿山之一。从成因上看,可认为是酸性火山岩,喷出年代为渐新世,中新世。于中新世和上新世遭到蚀变,泡沫状火山灰、火山弹和火山砾几乎已完全变成了蒙脱石,其最细的颗粒含有钠交换离子,而结晶度较好但无定向的较粗的颗粒则含有钙离子。大小为2～20μm 的粘土矿物碎屑,其离子组成为:Si_(7.98)Al_(0.02)(Al_(3.03) Fe~(3+)_(0.31) Mg_(0.65))Mg_(0.02) Ca_(0.16) Na_(0.20) K_(0.03)O_(20)(OH)_4·(H_2 O).钠基膨润土适用于铸造、土木工程(墙极结构等)、钻井泥浆、工业水处理、动物饲料配料等等。这种纯度的膨润土用于生产去垢剂、酿酒和其它要求重金属含量低的领域用做配料是极为可贵的。
This almost pure bentonite deposit was discovered while drilling in S’Aliderru, north-west Sardinia, Italy. The mine has been mined and it is one of the largest mines in Europe. From a genetic point of view, can be considered acidic volcanic rocks, eruption age Oligocene, Miocene. Was altered in the Miocene and Pliocene. Foamy volcanic ash, volcanic boulders and volcanic gravel almost completely turned into montmorillonite. The finest particles contained sodium exchange ions, while the crystallinity was better but no orientation The coarser particles contain calcium ions. The ion composition of the clay minerals with the size of 2 ~ 20μm is: Si_ (7.98) Al_ (0.02) (Al_ (3.03) Fe_ (3 +) _ (0.31) Mg_ (0.65)) Mg_ (0.02) Ca_ 0.16) Na_ (0.20) K_ (0.03) O_ (20) (OH) _4 · (H_2 O). Sodium bentonite is suitable for casting, civil engineering (wall structure etc.), drilling mud, industrial water treatment, animal feed ingredients and many more. This purity of bentonite for the production of detergents, brewing and other areas requiring low levels of heavy metals used as ingredients is extremely valuable.