Rhodochrosite
Автор:
Jesse Russell,Ronald Cohn, 74 стр., издатель:
"Книга по Требованию", ISBN:
978-5-5112-6942-9
High Quality Content by WIKIPEDIA articles! Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. The streak is white. Its Mohs hardness varies between 3.5 and 4. Its specific gravity is 3.5 to 3.7. It crystallizes in the trigonal system. The cleavage is typical rhombohedral carbonate cleavage in three directions. Crystal twinning often is present. It is transparent to translucent with refractive indices of n?=1.814 to 1.816, n?=1.596 to 1.598. It is often confused with the manganese silicate, rhodonite, but is distinctly softer. Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в информационном сетевом ресурсе "Википедия" в частности. Собранная по частотным запросам указанной тематики, данная компиляция построена по принципу подбора близких информационных ссылок, не имеет...