Heliotrope belongs to the feldspar group of gemstones, also known as "sunstone", "sun feldspar". Because the crystal contains hematite, acicular iron ore and mica and other mineral inclusions, the reflection of light and the emergence of golden yellow dazzling flash, that is, showing the "daylight effect", so it is called sunstone.
[Sunstone]
Alias: sunstone, sun feldspar, aventurine feldspar
Chemical formula: NaAlSi3O8 and CaAl2Si3O8
Color: yellow, brownish yellow or brown
Luster: glassy
Hardness: 6-7
Density: 2.65
Transparency: transparent
Refractive index: 1.537~1.547
Crystal system: monoclinic or triclinic crystal system
Birefringence: 0.007
Fracture: shell-shaped
☀️ [Daylight effect]
Sunstone feldspar containing hematite or acicular ferrite inclusions, these inclusions reflect the light parallel to each other, and show a golden yellow to red tones of the sparkling flash, often referred to as "aventurine" flash effect, also known as the "sunlight effect".
[Origin].
Sun feldspar is mainly produced in pegmatite and some long quartz veins. The famous Norwegian sun feldspar is produced in the anorthosite of the calcite chalcocite. Other important sources are California, Russia, Canada, South India, Madagascar and other places.
[Value]
Hinokite is a valuable jade stone that can be used to carve various ornaments and crafts. The output of heliotrope is relatively small, mostly used for collection, occasionally made into jewelry, mostly glass imitations. Evaluating the transparency of sunstone is extremely important; the more transparent the stone, the higher the value. The color has yellow to orange, translucent, dark inclusions reflective effect is good for sunstone.
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[Heliotrope vs Moonstone]
Sunstone and moonstone belong to the same feldspar family. Sunstone is named after the feldspar in many neatly arranged, bright red mineral flakes, flakes in the light, reflecting millions of golden bright spots, like the sun's rays;
Moonstone's name is due to the crystal clear feldspar, due to a special internal structure, and flashed a light blue, like the moonlight under the quiet night. Legend has it that they are gifts to mankind from the sun god and the moon god respectively.
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