"The Legend of the Fairy Stones" cleverly blends its astounding mixed bag of beautiful artwork with originally authored lyrical verse to share the story of real-life staurolite
The Sabin property is underlain by intermediate and minor felsic volcanic units that exhibit widespread alteration comprised of garnet, staurolite
, sillimanite and sericite metamorphic mineralogy.
Optical microscopy detected many other minerals among the heavy minerals of the Lemme samples, the contents of which remained near the detection limit of the XRD method (pyroxenes, epidotes, micas, tourmaline and apatite) or considerably lower (pyrite, barite, staurolite
, kyanite, monazite and titanite).
These very real stone crosses, officially called Staurolite
, form naturally through a geothermal process known as "cruciform penetration twinning".
In addition, at Staurolite
Ridge itself, these alkaline rocks are intimately associated with extensive areas and patches of copper-bearing carbonatite.
The coarse fraction is well sorted and consists mainly of subrounded quartz grains, with only minor amounts of other minerals (staurolite
, tourmaline, zircon and opaque minerals), except in the lower part of the profile at Kasangulu, which includes clustered occurrences of arkose-derived material.
Large metamorphic minerals (e.g., porphyroblasts such as biotite, garnet, andalusite and staurolite
) that contain passive inclusions are extraordinarily important because they are utilized in assessing the tectonic, metamorphic, and structural history of the mid- to deep-crustal levels of orogenic belts.
II: channelized fluid flow and the growth of staurolite
The rocks that host the Jiajika granite underwent multistage metamorphism during magmatism, which led to the development of the five distinct metamorphic zones that surround the granite (from inner to outer): diopside, staurolite
, andalusite-staurolite, andalusite, and biotite zones.
A high temperature-low pressure metamorphic assemblage of biotite, andalusite, staurolite
, garnet, muscovite, and quartz is developed in the sedimentary rocks up to 500 m from the granite (Ruitenberg 1967; Fyffe et al.
The micaschists of interest in this study are characterized by the presence of garnet and staurolite
porphyroblasts, muscovite, biotite, quartz, ilmenite and graphite.
The metamorphic rocks of the Silgara Formation in the Santander Massif (Figure 1) were metamorphosed to upper amphibolites facies during the Caledonian orogeny, developing a sequence of metamorphic zones (biotite, garnet, staurolite
and sillimanite) that defines the regional thermal structure.