pyrophanite

{{infobox mineral

|boxbgcolor=#856855| name = Pyrophanite

| boxtextcolor = #fff

| image = File:Pyrophanite-183958.jpg

| imagesize = 260px

| category = Oxide mineral

| formula = MnTiO₃

| IMAsymbol = Pph{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|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.CB.05

| dana = 4.3.5.3

| system = Trigonal

| class = Rhombohedral ({{overline|3}})
(same H-M symbol)

| symmetry = R{{overline|3}}

| unit cell = a = 5.13948(7) Å,
c = 14.2829(4) Å; Z = 6

| color = Deep blood-red to greenish black

| habit = Rarely as rosettes of hexagonal plates, typically granular, scaly; occurs as exsolution lamenae in franklinite and spinel

| cleavage = Perfect on {0221}

| fracture = Conchoidal

| tenacity = Brittle

| mohs = 5–6

| luster = Submetallic

| streak = Ochre yellow

| diaphaneity = Subtranslucent to opaque

| gravity = 4.537 measured

| opticalprop = Uniaxial (-)

| refractive = n_ω = 2.481 n_ε = 2.210

| birefringence = δ = 0.271

| impurities =Fe, Zn

| references = [http://rruff.info/doclib/hom/pyrophanite.pdf Pyrophanite in the Handbook of Mineralogy][http://www.mindat.org/min-3322.html Pyrophanite on Mindat.org][http://www.webmineral.com/data/Pyrophanite.shtml Pyrophanite data on Webmineral]

}}

Pyrophanite is a manganese titanium oxide mineral with formula: MnTiO₃. It is a member of the ilmenite group. It is a deep red to greenish black mineral which crystallizes in the trigonal system.