Molybdite

{{distinguish|Molybdenite}}

{{infobox mineral

| name = Molybdite

| image = Molybdite-Molybdenite-233200.jpg

| imagesize = 260px

| alt =

| caption = Molybdite on molybdenite from the Questa Molybdenum Mine (size: 11.0 x 6.7 x 4.1 cm)

| category =

| formula = MoO₃

| IMAsymbol = Myb{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |s2cid=235729616 |doi-access=free}}

| strunz = 4.EA.10

| dana =

| system = Orthorhombic

| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

| symmetry = Pbnm

| unit cell = a = 3.96 Å, b = 13.85 Å,
c = 3.69 Å; Z = 4

| color = Light greenish yellow to nearly colorless

| habit = Flattened needles or thin plates may occur in aggregates

| twinning =

| cleavage = Perfect on {100}, district on {001}

| fracture =

| tenacity = Flexible

| mohs = 3 - 4

| luster = Adamantine

| streak = White

| diaphaneity = Transparent

| gravity = 4.72

| density =

| polish =

| opticalprop = Biaxial (+)

| refractive =

| birefringence = High

| pleochroism =

| 2V = Large

| dispersion =

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| melt =

| fusibility =

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| prop1 =

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| references = {{Cite web|title=Molybdite|url=https://www.mineralienatlas.de/lexikon/index.php/MineralData?lang=en&mineral=Molybdite|access-date=2023-01-15|website=Mineral Atlas | type= database record }}[http://rruff.info/doclib/hom/molybdite.pdf Molybdite on the Handbook of Mineralogy]{{Cite web|title=Molybdite|url=https://www.mindat.org/min-2748.html|access-date=2023-01-15|website=www.mindat.org| publisher=Hudson Institute of Mineralogy}}{{Cite web|title=Molybdite Mineral Data|url=http://www.webmineral.com/data/Molybdite.shtml|access-date=2023-01-15|website=www.webmineral.com}}

}}

Molybdite is the naturally occurring mineral form of molybdenum trioxide MoO₃. It occurs as yellow to greenish needles and crystallizes in the orthorhombic crystal system.