albite law

albite law

[′al‚bīt ‚lȯ]
(crystallography)
A rule specifying the orientation of alternating lamellae in multiple twin feldspar crystals; the twinning plane is brachypinacoid and is common in albite.
References in periodicals archive ?
Some crystals appear to be twinned according to the albite law. Electron microprobe analyses of these crystals show they are essentially pure albite ([sim][Ab.sub.98][An.sub.01][Or.sub.01]), containing approximately 0.24 weight % SrO.
Albite forms water-clear crystals twinned on the Albite Law, in sizes to 7 mm.
In cavities it forms glassy, colorless, milky to transparent, tabular crystals up to 7 mm, twinned on the albite law. It is nearly always associated with abundant quartz, gudmundite and dolomite, often with stibnite, and occasionally with pyrrhotite or berthierite.