1·Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
2·Cementation is showed by the secondary enlargement of quartz and feldspar, the successive formation and pores filling of cementing material of authigenic clay mineral, calcite and anhydrite, etc.
胶结作用表现为石英和长石的次生加大、自生粘土矿物、碳酸盐和硬石膏胶结物的依次形成并充填孔隙。
3·In this paper, effect of anhydrite calcined at different temperatures on the hydration of Portland cement is studied.
研究了不同温度煅烧的硬石膏对硅酸盐水泥水化过程的影响。
4·The rocks are lithic arkose and arkose which are in low composition saturation and has high clay content, anhydrite, calcite and dolomite cements.
岩石类型为成分成熟度较低的岩屑长石砂岩和长石砂岩，并合较多的粘土矿物和硬石膏、方解石、白云石胶结物。
5·Locally dolomite and anhydrite are important as cements, together with minor authigenic quartz.
在局部地方白云石和硬石膏也是重要的胶结物；还有少量自生石英。