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Cryptomelane (K(Mn4+,Mn2+)8O16) is the potassium endmember of the hollandite group, a family of tectomanganates with a 2 × 2 tunnel structure.
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manganese oxide black hollandite psilomelane tunnel structure name minerals referred tombstone arizona association various oxides occurs mn4 mn2 8o16 group
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Cryptomelane | Alters to | Tarnishes to dull grayish black | 1.00 | infobox |
| Cryptomelane | Category | Oxide mineral | 1.00 | infobox |
| Cryptomelane | Color | Steel-gray to bluish gray; light tan or gray in reflected light | 1.00 | infobox |
| Cryptomelane | Crystal class | Dipyramidal (4/m) H-M symbol: (4/m) | 1.00 | infobox |
| Cryptomelane | Crystal habit | Rare as subhedral crystals, commonly as compact fine-grained masses, banded colloform, botryoidal, or radial fibrous aggregates | 1.00 | infobox |
| Cryptomelane | Crystal system | Tetragonal | 1.00 | infobox |
| Cryptomelane | Diaphaneity | Opaque | 1.00 | infobox |
| Cryptomelane | Formula | K(Mn4+,Mn2+)8O16 | 1.00 | infobox |
| Cryptomelane | Fracture | Conchoidal | 1.00 | infobox |
| Cryptomelane | IMA symbol | Cml | 1.00 | infobox |
| Cryptomelane | Luster | Metallic to dull | 1.00 | infobox |
| Cryptomelane | Mohs scale hardness | 6 – 6.5 | 1.00 | infobox |
| Cryptomelane | Space group | I4/m | 1.00 | infobox |
| Cryptomelane | Specific gravity | 4.17 – 4.41 | 1.00 | infobox |
| Cryptomelane | Streak | Brownish black | 1.00 | infobox |
| Cryptomelane | Strunz classification | 4.DK.10 | 1.00 | infobox |
| Cryptomelane | Tenacity | Brittle | 1.00 | infobox |
| Cryptomelane | Twinning | Twinning developed on (010) and (101) resulting in a pseudotetragonal unit cell. | 1.00 | infobox |
| Cryptomelane | Unit cell | a = 9.956 Å, b = 2.8705 Å, c = 9.706 Å; β = 90.95°; Z = 1 | 1.00 | infobox |
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