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In some stones, the inclusion of small, white, radially clustered crystals (spherulites) of the mineral cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). Obsidian may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being ...
Although helenite and obsidian are both forms of glass, helenite differs from obsidian in that it is man-made. The stone has been marketed by the jewelry industry because of its emerald-like color, good refractive index, although its durability is low. It has a hardness of just 5 to 5 ½ and chips about as easily as obsidian or window glass.
The Tale of the Stone Flower is based on the Russian Ural folk tale The Stone Flower by Pavel Bazhov. Briefly, the story takes place in the Ural Mountains of central Russia. The male lead, young Danilo, is engaged to the beautiful Katarina. Unfortunately the Mistress of Malachite Mountain tempts Danilo with a legendary stone flower.
Spherulites in rhyolitic ash, Hailstone Trail, Echo Canyon, Chiricahua Mountains, Arizona Spherulite markings on snowflake obsidian Photomicrograph of rhyolite, showing spherulitic texture (brown, between grey to white crystals) In petrology, spherulites (/ ˈ s f ɛr ʊ l aɪ t s, s f ɪər-/) are small, rounded bodies that commonly occur in ...
Macro photography of a natural snowflake. A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of clear ice. This is because the many small crystal facets of the snowflakes scatter the sunlight between them. [4]
A single snowflake is a single crystal or a collection of crystals, [15] while an ice cube is a polycrystal. [16] Ice crystals may form from cooling liquid water below its freezing point, such as ice cubes or a frozen lake.