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$38.00 USD
Precio

55 CTS ASTROPHYLITE ROUGH SLAB

4902
5

SKU
[F3909 ]
Dimensiones (mm)
x x mm
Peso (cts)
Colores

QUALITY ROUGH

ASTROPHYLITE ROUGH

This is a natural untreated slab ready for polishing.Due to the different hardness of the two materials we recommend  treating the stone with opticon or resin to get a good polish.Mined in the Kola

Weight 55 cts app

Size 29x35x10  mm app

The needles are a  interesting copper bronze colour which is hard to see in the pictures.This will be a interesting stone to polish and a challenge.!

Note we have taken the photo with the stone wet to give you a idea how it will  look polished. We have also taken a photo of both sides of the slab.

 

Astrophyllite is a very rare, brown to golden-yellow hydrous potassium iron titanium silicate mineral. Belonging to the astrophyllite group, astrophyllite may be classed either as an inosilicate, phyllosilicate, or an intermediate between the two. It forms an isomorphous series with kupletskite, to which it is visually identical and often intimately associated. Astrophyllite is of interest primarily to scientists and collectors.

Heavy, soft and fragile, astrophyllite typically forms as bladed, radiating stellate aggregates. It is this crystal habit that gives astrophyllite its name, from the Greek words astron meaning "star" and phyllon meaning "leaf". Its great submetallic gleam and darkness contrast sharply with the light (felsic) matrix the mineral is regularly found within. Astrophyllite is usually opaque to translucent, but may be transparent in thin specimens.

As the crystals themselves possess perfect cleavage, they are typically left in stead, the entire aggregate often cut into slabs and polished. Owing to its limited availability and high cost, astrophyllite is seldom seen in an ornamental capacity. It is sometimes used in jewellery where it is fashioned into cabochons.

Found in cavities and fissures in unusual felsic igneous rocks, astrophyllite is associated with feldspar, mica, titanite, zircon, nepheline, and aegirine. Common impurities include magnesium, aluminium, calcium, zirconium, niobium, and tantalum. It was first discovered in 1854 at its type locality; Laven Island, Norway. Interestingly, kupletskite was not known until 1956, over a hundred years later.

                                                                           

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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
Mermaid Waters , Australia
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19061 de comentarios

  • rustynut
    rustynut
    Positivo

    Good stone great service

  • martin11
    martin11
    Positivo

    Great thank very much, lovely pearls.

  • philsgems
    philsgems
    Positivo

    Nice piece of rough. thankyou

  • philsgems
    philsgems
    Positivo

    Nice stone. Thankyou

  • philsgems
    philsgems
    Positivo

    Have received the rough. Nice colour. Thankyou

5%
Código promocional SEDADEALS
Válido hasta
2nd Jan 2025

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Detalles de envío

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Se envía desde:
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Descripción general

Tipo de listado : Standard
ID del Producto : 339950
Empieza : 20th December 2024 08:00 pm PST
* Todos los precios están en USD