Alkali feldspar granite

Alkali feldspar granite is a type of granite rock that contains a high proportion of potash-feldspar, which is retrieved from the rock. It typically consists of medium to coarse-grained K-feldspar and quartz, with minor amounts of plagioclase, magnetite, and biotite. The feldspar in this type of granite is classified as alkali-feldspar, which distinguishes it from other types of feldspar.From: Wear of Rock Cutting Tools [2020], Relationships between magmatism and deformation in northern Yorke Peninsula and southeastern Proterozoic Australia [2018]

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Published in H.J.R. Deketh, Wear of Rock Cutting Tools, 2020

H.J.R. Deketh

Mortar compositions mc 16 and mc 17 contained glass or feldspar grains instead of quartz. The glass consisted of fused silica (99 vol. % of SiO2) and the feldspar was a potash-feldspar retrieved from an alkali-feldspar granite. Both have Mohs hardness 6 (Mohs hardness of quartz is 7). The equivalent Vickers hardness is about 750 VH, which is only slightly higher than the virgin hardness of dredge steel.

Relationships between magmatism and deformation in northern Yorke Peninsula and southeastern Proterozoic Australia

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Published in Australian Journal of Earth Sciences, 2018

A. Brotodewo, C. J. Tiddy, A. Reid, C. Wade, C. Conor

The alkali-feldspar granite generally comprises medium to coarse-grained K-feldspar and quartz, with minor plagioclase, magnetite and biotite. Minor microcline is observed. Sericite and hematite alteration of feldspars is preserved (Figure 5d). Minor perthitic exsolution is also observed. At Wallaroo North Beach, a local prominent foliation in the alkali-feldspar granite is defined by quartz and significantly sericite altered and brecciated feldspars (Figure 5e). At Black Rock, the alkali-feldspar granite also contains amphibole, with higher modal proportion of biotite and more intense sericite alteration (Figure 5f). Minor hematite is commonly preserved and is present in thin veins.

Alkali feldspar granite

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Test results on artificial rock (mortar)

Relationships between magmatism and deformation in northern Yorke Peninsula and southeastern Proterozoic Australia