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Microlite 0.522cts Trillion Cut 4.33 x 4.37mm from from Skardu – Pakistan. H5-5.5 Y11634

$180.00 $135.00

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Description

Microlite 0.522cts Trillion Cut 4.33 x 4.37mm from from Skardu – Pakistan. h5-5.5 Y11634

Formula:

A2-mTa2X6-wZ-n

The A site, therefore, may host Na, Ca, Sr, Pb2+, Sn2+, Sb3+, Y, U, □, or H2O or, less frequently Ag, Mn, Ba, Fe2+, Bi3+, Ce (and other REE), Sc or Th.

X typically is O but can include subordinate OH and F.

Z typically is an anion, but can also be a vacancy, H2O, or a very large (>> 1.0 Å) monovalent cation (site 8b). Examples are OH–, F, O, □, H2O, K, Cs, Rb.

The symbols m, w, and n represent parameters that indicate incomplete occupancy of the A, X and Z sites, respectively. (Atencio et al. 2010).

Colour:

Pale yellow to reddish brown, sometimes emerald-green

Lustre:

Vitreous, Resinous

Hardness:

5 – 5½

Specific Gravity:

5.9 – 6.4

Crystal System:

Isometric

Name:

The microlite group has its name after the generic name microlite which was first introduced in 1835 by C.U. Shepard. From the Greek μικρός, small, in allusion to the usually small size of the crystals from the first recorded locality.
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