Cerusite |
| PbCO3 |
| Orthorhombic |
Forms
b(010), m(110), r(130), y(102),
p(302), x(012), k(011),
q(023), j(053), i(021), v(031), z(041), n(051), o(112),
p(111), s(121), and w(211). The form j(053) is new; r measured 50° 41' (computed 50° 18').
| Forms | Illustrations | |
| 1 | b, m, r, y, p, x, k, j, i, v, z, n, o, p, s | Figure 63 |
| 2 | b, m, y, x, k, i, o, p. Twin on (110) | Figure 64 |
| 3 | b, m, y, x, q, k, i, o, p, w. Twin on (110) | Figure 65 |
Occurrence
Cerusite forms clear white or gray crystals
encrusting galena. It was found as a scarce alteration product of galena at Sterling Hill.
The measured crystals, collected there in 1905, are prismatic parallel to the brachyaxis
(figure 63), with a richly developed zone of brachydomes. Others are twinned in the
ordinary cerusite habits.
| Figure 63 Crystal of cerusite. Prismatic parallel to the brachyaxis, showing the forms b(010), x(012), k(011), j(053), i(021), v(031), z(041), n(051), y(102), p(302), m(110), r(130), p(111), s(121), and o(112). Sterling Hill. |
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Figure 64 Plan of a crystal of cerusite like that of figure 63, twinned on the prism (110). Sterling Hill. |
| Figure 65 Fragment of a complex crystal of cerusite twinned on the prism (110). A, Plan; B, clinographic projection. |
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Website
© by Herb Yeates 1997-2006.
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page created: August 12, 2006 5:52 PM
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