Product Name: Black Tourmaline Natural Raw Specimen for Collectors
Stock Code: MNR1217
Stone / Mineral: Black Tourmaline (Schorl)
Product Group: Mineral Specimen for Collectors
Form: Natural Raw Specimen / Rough Mineral
Brand: Eysell
Weight: 396 gr
Height:14 cm
Width:6,5 cm
Origin:Pakistan
Black Tourmaline Natural Raw Specimen for Collectors – MNR1217 is a distinctive collector's piece showcasing the natural form of Schorl, the black, iron-rich member of the tourmaline mineral group.
Schorl is one of the most common members of the tourmaline group found in nature. Its colour, ranging from black to dark brownish black, its vitreous lustre and its longitudinally striated prismatic crystal faces make it particularly striking.
Unlike cut or polished stones, natural mineral specimens in their raw form retain the mineral's natural crystal growth, surface texture and geological character. As a result, each Black Tourmaline specimen has a different shape, crystal distribution and natural texture.
Mineralogical Properties of Black Tourmaline (Schorl)
Property Details
Mineral Group Tourmaline
Mineral Variety Schorl
Mineral Class Borosilicate
Crystal System Trigonal
Hardness Mohs 7–7,5
Colour Black – Brownish Black
Lustre Vitreous – Resinous
Streak White
Transparency Usually Opaque
Fracture Uneven – Conchoidal
Chemical Structure
The idealised chemical formula commonly used for Schorl:
NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
As ionic substitutions and variations in chemical composition can occur in natural tourmalines, the composition of actual mineral specimens may differ to some extent from the ideal formula.
Natural Formation
Black Tourmaline commonly forms in granitic pegmatites in particular. Crystal aggregates found alongside minerals such as quartz and feldspar are of particular interest to mineral collectors because of their aesthetic appearance.
Well-developed prismatic crystals can clearly display the longitudinal striations characteristic of tourmaline.
Product Highlights
Natural Black Tourmaline (Schorl)
Raw mineral specimen for collectors
Characteristic deep black appearance
Natural crystal and surface texture
Suitable for mineral and geological collections
Suitable for decorative display
Natural formation unique to each piece
