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Opal

/ˈəʊpəl/

A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.

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📖 Definitions of "Opal"

noun

1
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
2
A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
3
Any of various lycaenid butterflies of the genus Nesolycaena.

💡 Words with a Similar Meaning to "Opal"

Found via reverse dictionary — words that share a conceptual meaning.

Word	Definition
moonstonenoun	(mineralogy) A translucent gemstone, an orthoclase feldspar, that has a pearly lustre.
hyalitenoun	(mineralogy) A form of opal.
menilitenoun	(mineralogy) A greyish-brown form of opal.
girasolnoun	A fire opal.
geyseritenoun	(mineralogy) A type of stone, a mixture of quartz and opal deposited by a geyser as it precipitates out of the boiling water.
gemstonenoun	A gem, usually made of minerals.
gemnoun	A precious stone, usually of substantial monetary value or prized for its beauty or shine.
roanoun	A surname.
phytolithsnoun	A small particle of silica or mineral that occurs in many plants.
silicon dioxidenoun	(chemistry) A hard glassy mineral, SiO₂, occurring as quartz, sand, opal etc. Informally known as silica.
semiopalnoun	(mineralogy) A translucent variety of opal
sonolitenoun	(mineralogy) A monoclinic-prismatic mineral containing fluorine, hydrogen, manganese, oxygen, and silicon.
opaline	Resembling opal in having a milky white iridescence.
aluminosilicatenoun	(inorganic chemistry) Any of many silicate minerals, such as feldspar and zeolite, in which a proportion of the Si⁴⁺ ions are replaced by Al³⁺, the excess negative charge being balanced by extra sodium, potassium or calcium ions.
quartznoun	(mineralogy) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO₂. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.
palmieritenoun	(mineralogy) A trigonal-hexagonal scalenohedral mineral containing lead, oxygen, potassium, sodium, and sulfur.
orthosilicatenoun	(mineralogy) Any silicate mineral, such as garnet or olivine, in which the SiO₄ tetrahedra do not share oxygen atoms with each other.
sillimanitenoun	(mineralogy) A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅.
quartzinenoun	(mineralogy) A fibrous form of silica similar to chalcedony.
analcimenoun	(mineralogy) A sodium aluminosilicate with a chemical formula NaAlSi₂O₆·H₂O, having a zeolite structure, found in alkaline basalts.