Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Crystallography is regular. It follows the -ies Conversion rule.
Use plural verbs: "The crystallographies are ready" (not "is ready").
Yes. The plural crystallographies is standard across all English variants.
The word crystallography follows the standard English pluralization rule. When forming the plural, crystallography becomes crystallographies. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why crystallography becomes crystallographies helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using crystallographies in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The crystallographies are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.