Mineral monoclinic

Sodium Pentaborate Pentahydrate. Sodium pentaborate pentahydrate, NaB Og -5H20 or Na20 -5B203 -10H2O formula wt, 295.11 monoclinic sp gr, 1.713 exists in nature as the mineral sborgite [12272-01 -4]. Heat capacity, entropy, and other thermal measurements have been made at 15-345 K (85). 

Sodium Calcium Pentaborate Pentahydrate. Sodium calcium pentaborate pentahydrate, NaCaB O 5H20 or Na20 2CaO 5B2O2 10H2O formula wt 351.19 monoclinic sp gr, 2.14 exists ia nature as the mineral probertite. Probertite can be prepared by heating a... 

There are four basic sulfates that can be identified by potentiometric titration using sodium carbonate (39,40) langite [1318-78-17, CuSO -3Cu(OH)2 H2 i brochantite [12068-81 -4] CuSO -3Cu(OH)2 antedite [12019-54-4] CuSO -2Cu(OH)2 and CuS0 -Cu0-2Cu(0H)2-xH20. The basic copper(II) sulfate that is available commercially is known as the tribasic copper sulfate [12068-81 ] CuS04-3Cu(0H)2, which occurs as the green monoclinic mineral brochantite. This material is essentially insoluble in water, but dissolves readily in cold dilute mineral acids, warm acetic acid, and ammonia solutions. 

Pressure-induced phase transitions in the titanium dioxide system provide an understanding of crystal structure and mineral stability in planets interior and thus are of major geophysical interest. Moderate pressures transform either of the three stable polymorphs into the a-Pb02 (columbite)-type structure, while further pressure increase creates the monoclinic baddeleyite-type structure. Recent high-pressure studies indicate that columbite can be formed only within a limited range of pressures/temperatures, although it is a metastable phase that can be preserved unchanged for years after pressure release Combined Raman spectroscopy and X-ray diffraction studies 6-8,10 ave established that rutile transforms to columbite structure at 10 GPa, while anatase and brookite transform to columbite at approximately 4-5 GPa. 

Pyrrhotite is a relatively slow floating mineral, especially monoclinic pyrrhotite, which is usually present in these ore types. The floatability of pyrrhotite also decreases when using certain hydrophobic mineral depressants, such as guars and dextrins. The flotation of pyrrhotite may improve with small additions of copper sulphate (CuS04). 

Monohydrate, Ba(0H)2 H20 is a white powder density 3.743 g/cm shght-ly soluble in water soluble in dilute mineral acids. Octahydrate, Ba(0H)2 8H20 is a colorless monoclinic crystal density 2.18 g/cm at 16°C refractive index 1.50 melts at 78°C vapor pressure 227 torr loses seven molecules of water of crystallization when its solution is boiled in the absence of atmospheric CO2 forming solid monohydrate further heating produces anhydrous Ba(OH)2 melting at 407°C readily dissolves in water (3.76 g/100 g at 20°C and 11.7 g/100 g at 50°C) aqueous solution highly aUtahne also soluble in methanol shghtly soluble in ethanol insoluble in acetone. 

The tetrahydrate of the tribasic phosphate, Mg3(P04)2 4H2O is a bulky and soft white powdery material monochnic crystals density 1.64 g/cm at 15°C slightly soluble in water (0.2 g/L at 20°C) soluble in acids. The naturally occurring octahydrate, bobierite, is a white crystalline solid, containing monoclinic plates refractive index 1.510 density 2.195 g/cm at 15°C loses three molecules of water of crystallization at 150°C loses all water at 400°C insoluble in water soluble in dilute mineral acids. 

The monohydrate MgS02 H20, as the mineral kieserite, consists of colorless monoclinic crystals refractive index 1.523 density 2.445 g/cm becomes anhydrous on heating at 200°C soluble in water. 

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