What does the following phrase mean: 故虽有珉之雕雕,不若玉之章章——《荀子》 The character 珉 from the original phrase  is said to mean "an apple of Sodom"...is that true?  If so, what does that even mean?  I though the character 珉 meant a jade-like stone as it has the particle 王 = 玉 (jade).
Even 珉 is beautiful and looks like 玉, it's still stone. 

So 故虽有珉之雕雕,不若玉之章章 means, even 珉 is beautiful and has high value to  be engraved (to artwork), it's still not as clear and beautiful as 玉.