Ingabe i-quartzite ingcono kune-granite? I-Granite ne-quartzite zombili ziqinile kunemabula, okwenza zifaneleke ngokulinganayo ukusetshenziswa ekuhlobiseni indlu. I-quartzite, ngakolunye uhlangothi, inzima kancane. I-Granite inobulukhuni be-Mohs obungu-6-6.5, kuyilapho i-quartzite inobulukhuni be-Mohs ...
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