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Like amethyst, heat-treated amethyst often exhibits color zoning, or uneven color distribution throughout the crystal. In geodes and clusters, the color is usually deepest near the tips. [ 9 ] Unlike heat-treated amethyst, natural citrine typically exhibits even coloration throughout the crystal and never occurs in geodes or clusters.
Oversaturation of urine with crystals is by far the biggest factor in stone formation in dogs and cats. [3] This oversaturation can be caused by increased excretion of crystals by the kidneys, water reabsorption by the renal tubules resulting in concentration of the urine, and changes in urine pH that influence crystallization.
The ideal crystal shape is a six-sided prism terminating with six-sided pyramid-like rhombohedrons at each end. In nature, quartz crystals are often twinned (with twin right-handed and left-handed quartz crystals), distorted, or so intergrown with adjacent crystals of quartz or other minerals as to only show part of this shape, or to lack ...
The streak is white, like most silicates. The refractive index ranges from 1.559 to 1.573 and twinning is common. As with all plagioclase members, the crystal system is triclinic , and three directions of cleavage are present, two of which are nearly at right angles and are more obvious, being of good to perfect quality (while the third ...
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Citrine (protein), a type of yellow fluorescent protein; Citrine, a 2016 album by Hayley Kiyoko; Citrine (programming language), a programming language for Unix-like operating systems; Citrine, a commonly-used informal name for ABC of Chairmanship by Walter Citrine
Ametrine, as its name suggests, is commonly believed to be a combination of citrine and amethyst in the same crystal. However, sources do not agree that the yellow-orange quartz component of ametrine may properly be called citrine.
Cystinuria; Other names: Cystinuria-lysinuria [1]: These cystine crystals were found in the urine sediment of a male dog who presented to the veterinary hospital with a history of chronic stranguria (straining to urinate) and pollakiuria (abnormally increased frequency of urination).