| Weight | 0,1 kg |
|---|---|
| Sales Unit | |
| Minimum order | 200 gr |
| Type | |
| Dimensions (±) | 3 - 4 cm |
| Number | 50 pieces per kg |
| Origin | |
| SKU | 6281 |
Tourmaline quartz Gemstones
Sales unit: Per 100 gr
Minimum order: 200 gr
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Tourmaline quartz Gemstones
Tourmaline
Tourmaline is a group of borosilicate minerals with a complex chemical composition and a wide variety of colours. It occurs in virtually every colour of the rainbow, including pink, green, blue, black and multi-coloured combinations. This variety makes tourmaline one of the most popular gemstones in the jewellery world.
Tourmaline usually forms in pegmatites and metamorphic rocks. Major deposits include Brazil, Afghanistan, Mozambique, Nigeria and the United States. The chemical formula varies, but a general form is (Ca,K,Na)(Al,Fe,Li,Mg,Mn)₃(Al,Cr,Fe,V)₆(BO₃)₃(Si,Al,B)₆O₁₈(OH,F)₄. The hardness is between 7 and 7.5 on the Mohs scale.
Popular varieties include black tourmaline (schörl), pink tourmaline (rubellite), green tourmaline (verdelite) and watermelon tourmaline (pink interior, green rim).
Sources:
Mindat.org, Gemdat.org, Wikipedia - Tourmaline
Quartz
Quartz is een van de meest voorkomende en veelzijdige mineralen op aarde. Het komt voor in een breed scala aan vormen en kleuren, van helder bergkristal tot rozenkwarts, rookkwarts en amethist. Kwarts bestaat uit siliciumdioxide en vormt zich in zowel stollings-, metamorfe als sedimentaire gesteenten.
Belangrijke vindplaatsen zijn onder andere Brazilië, Madagaskar, India, Zwitserland en de Verenigde Staten. De chemische formule is SiO₂, en het mineraal heeft een hardheid van 7 op de schaal van Mohs.
Bekende varianten zijn onder andere bergkristal (kleurloos), amethist (paars), rozenkwarts (roze), rookkwarts (grijs tot bruin) en citrien (geel tot oranje).
Sources:
Mindat.org, Gemdat.org, Wikipedia - Quartz
Imposing bricks
Lay-on stones are flat, tumbled and smoothly polished (precious) stones that, due to their oval to round shape and flat sides, are suitable for laying on the body, for instance during a relaxation moment. Compared to regular tumble stones and pocket stones, overlay stones have a more flattened shape, which makes them stay well in place. Despite this consistency, it remains a natural product, so variations in shape, colour and pattern can always occur. This can vary from one type of stone to another.
Generally, overlays have a size between 3 and 4 cm with a thickness of about 1 cm. Almost all our overlays are cut in China, where they are carefully selected and processed. The product photos give a good impression of what to expect. Lay-on stones are sold per 100 gr (1x), with a minimum order of 200 gr (2x).
