• Where a very hard rock is subjected to severe stresses, it may rupture into ( highly ) irregular angular blocks.
• Crystals of highest purity are often irregularly shaped ( or irregular in shape ).
• Where a very hard rock is subjected to severe stresses, it may rupture into ( highly ) irregular angular blocks.
• Crystals of highest purity are often irregularly shaped ( or irregular in shape ).
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012