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cassiterite

cassiterite

Tanzania

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Product Specification

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Product Description

Cassiterite
 
Formula:
SnO
 
2
 
System: Tetragonal Colour: Black, yellow, brown, ...
Lustre: Adamantine, Greasy, Sub-Metallic Hardness: 6 - 7
Member of: Rutile Group
Name: The mineral name is derived from the term “Cassiterides” which was applied 'islands off the western coast of Europe' in pre-Roman times (the exact location of these 'islands' has been hotly debated over the years, current thought is that the source was probably mainland Spain and that even 2000 years ago, traders had a habit of providing misleading locality information to protect their sources).
Isostructural with: Rutile
 


The primary ore of Tin, this mineral is found in hydrothermal veins and pegmatites associated with granite intrusions. Because of its durability it is also frequently found concentrated in alluvial placer deposits, sometimes in large enough quantities to be commercially exploitable, as in Malaysia, for example.
Classification of Cassiterite
IMA status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID: 4/D.02-40
Nickel-Strunz 10th (pending) edition ID: 4.DB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
Dana 8th edition ID: 4.4.1.5

4 : SIMPLE OXIDES
4 : AX2
Hey's CIM Ref.: 7.11.2

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
Occurrences of Cassiterite
Geological Setting: In medium- to high-temperature hydrothermal veins and greisens, alluvial placers.
Physical Properties of Cassiterite
Lustre: Adamantine, Greasy, Sub-Metallic
Diaphaneity (Transparency): Transparent, Translucent, Opaque
Colour: Black, yellow, brown, red or white.
Streak: Brownish white, white, greyish
Hardness (Mohs): 6 - 7
Hardness (Vickers): VHN200=1239 - 1467 kg/mm2
Tenacity: Brittle
Cleavage: Imperfect/Fair
{100} imperfect, {110} indistinct.
Parting: More or less distinct on {111} or {011}.
Fracture: Irregular/Uneven, Sub-Conchoidal
Density (measured): 6.98 - 7.01 g/cm3
Density (calculated): 6.993 g/cm3
Crystallography of Cassiterite
Crystal System: Tetragonal
Class (H-M): 4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group: P42/mnm {P42/m 21/n 2/m}
Cell Parameters: a = 4.7382(4) Å, c = 3.1871(1) Å
Ratio: a:c = 1 : 0.673
Unit Cell Volume: V 71.55 ų (Calculated from Unit Cell)
Z: 2
Morphology: Untwinned crystals usually short prismatic [001] with {110} and {100} prominent. Long prismatic at times, or with acute terminations. Less commonly pyramidal. Faces {001} and {110} frequently uneven; faces in zone [10_1] and in zone [001] often striated parallel to their intersections. Fibrous, botryoidal crusts or concretionary masses. Granular, coarse to fine.
Twinning

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Contact Person : Hashim

Company:Rungwe

Address:Tanzania,

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