Theme: mineral bending materials plan: aerial connectors gypsum binders

The form of finding plaster in natureShape of crystals. Forms thick and thin Tabular crystalsOften couples are characteristic in appearance - "pigeon tails".Fusion twins are common and come in three types: 1.Gallic contact twins (100), 2.Communication with Paris doubled (101) 3.According to (209), cruciform twins are less common. It is not always easy to separate them.The first two species resemble pigeon tails.Gallic twins m(110) are characterized by the edges of the prism parallel to the twin plane, and the edges of Prism L (111) form a reentrant angle, while in Paris twins the edges of the prism are L. (111) parallel to the twin seam.

Tabiatda gipsni topish shakli Kristallarning shakli. Qalin va yupqa jadvalli kristallar hosil qiladi Ko'pincha er-xotinlar tashqi ko'rinishda xarakterlidir - "kabutar quyruqlari". Fusion egizaklari keng tarqalgan va uch xil bo'ladi: 1.Gallik kontakt egizaklari (100), 2.Parij bilan aloqa ikki baravar ko'paydi (101) 3.(209) ga ko'ra xochsimon egizaklar kamroq tarqalgan. Ularni ajratish har doim ham oson emas. Birinchi ikki tur kaptar dumiga o'xshaydi. Gallik egizaklari m(110) prizmaning chetlari egizak tekislikka parallel bo‘lib, l(111) prizma qirralari reentrant burchak hosil qilishi bilan xarakterlanadi, Parij egizaklarida esa prizmaning chetlari l. (111) egizak tikuvga parallel.

Chemical propertiesIt has significant solubility in water. An excellent feature of the plaster is that its solubility with an increase in temperature reaches a maximum of 37-38 ° c estadio and then drops very quickly. The greatest drop in solubility is established by the fact that at temperatures above 107 ° c, "hemihydrate" - Ca is hostile. 1/2 H2O.In water acidified with H2SO4, pure sugar dissolves much better in karagan. However, when the concentration of H2SO4 is higher than 75 g/l, the solubility drops sharply. Very slightly soluble in HCl.

Kimyoviy xossalari Suvda sezilarli eruvchanlikka ega. Gipsning ajoyib xususiyati shundaki, uning eruvchanligi harorat oshishi bilan 37-38 ° C da maksimal darajaga etadi va keyin juda tez tushadi. Eruvchanlikning eng katta pasayishi 107 ° C dan yuqori haroratlarda "gemihidrat" - Ca hosil bo'lishi sababli o'rnatiladi. 1/2 H2O. H2SO4 bilan kislotalangan suvda toza suvga qaraganda ancha yaxshi eriydi. Biroq, H2SO4 konsentratsiyasi 75 g/l dan yuqori bo'lsa, eruvchanlik keskin pasayadi. HCl da juda oz eriydi.