Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
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Glossary of Terms
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL



Mineraloid
Amorphous, inorganic substance lacking a defined crystal structure. Though not truly recognized as minerals, many references still classify them as minerals.



Opal is Classified as a Mineraloid



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