Silky luster

ULEXITE. This mineral, a hydrated borate of sodium and calcium. NaCaBsOg 8H2O, is a product of crystallization in arid regions from shallow playas and lakes. Ulexite crystallizes in the tridinic system, but usually occurs in rounded masses of line-libered acicular crystals. The hardness is 2.5. specific gravity, 1.96, silky luster and white color. The mineral is found abundantly in Chile and Argentina and in Nevada and California in the United States. Ulexite is a source of boron. 

Following are the definitions of the above terms Common banded is the common variety of bituminous and subbituminous coals it consists of a sequence of irregularly alternating layers of lenses of a homogeneous blk material having a brilliant vitreous luster a grayish-blk less brilliant striated material usually of silky luster and thin bands or lenses of soft powder and fibrous particles, known as (usain or mineral charcoal. The difference in luster of the bands is greater... 

Properties White to gray or yellowish color, dull to silky luster. Fluorescent in UV light. D 3.5 1.0, Mohs hardness 2.0-2.5. 

Properties White to light-green color, vitreous to silky luster. Mohs hardness 5-6, d 3.0-3.3, resistant to acids. Noncombustible. 

Properties White color silky luster. Mohs hardness 1-2.5, d 1.96. Usually found as rounded, loose-textured masses of fine crystals. 

Properties White or gray mineral, sometimes pale red, white streak and adamantine or silky luster. D 5.57-5.76, Mohs hardness 2-3. 

When cellulose is treated with carbon disulphide and sodium hydroxide, a cellulose xanthate is formed. This salt when stirred with a small amount of water forms a thick solution, called viscose, which is converted into cellulose hydrate by heat or certain salts. By squirting viscose through capillary tubes into a solution which brings about this decomposition, threads of cellulose are obtained having a silky luster. From these artificial silk is made. Viscose is also used for paper-sizing, in textile printing, and as a cement. 

The cinnamon-brown crystals of a silky luster are immediately decomposed by cold water (hydration). 

The d-tartrate crystals obtained in B are recrystallized from hot water. Rapid cooling yields needles with a silky luster these disappear on standing for 1-2 hours in the mother liquor and are replaced by coarse platelike crystals. 

The free base crystallizes from water or preferably dilute alcohol as a hydrate (5.5 moles water) in brilliant yellow needles, which when dried in the air have a fine, silky luster (182). If dried at 100° the crystals lose three moles of water and their luster at 110° they turn yellow-brown and at 160° decomposition sets in. The solubility of berberine in cold water is 1 part in 4.5 parts at 21° and in alcohol it is 1 in 100. 

Pineapple leaves from which PALF are extracted are about 70-90 cm in length and 5-7.5 cm in width. Figure 12.2a shows the sword-shaped, dark green pineapple leaves, while Fig. 12.2b shows the extracted PALF bundles from the leaves. Manual extraction process can extract at least 3 % of fibers from the leaves (Paul 1980). PALF are strong, white, and with a silky luster (Fig. 12.2c) and they are usually used to produce rope, broom, mat, nets, and cloths (Bhaduri et al. 1983). 

Serpentine Mg3(OH),SiA Type B + silicate layer on one side l Serpentines are commonly greenish yellow and have a greasy or silky luster and a slightly soapy feel... 

The dark brown mineral navajoite V205-3 H2O = VO(OH)3 has a monoclinic yet unknown structure. The crystals are described as soft and fibrous with a silky luster [1]. 

Uses W/o and o/w coemulsifier for cosmetic creams and lotions codispersant for bath oils conditioner for hair care prods, imparting silky luster Properties Yel. cl. liq. vise. 220 mPa S HLB 8.9 pH 5-7 (1% aq.)... 

---