Formula: Mn6(CO3)2(OH)7(Cl,OH)
Origin of name: For Michael Holdaway, American petrologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Subhedral grains in anastomosing mesh of veinlets 1-8 mm thick, patches and blebs 1-4 cm diameter
Hardness: 3
Specific gravity: 3.19
Cleavage: 1; {100}perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Turns brown on exposure; effervesces weakly in dilute HCl
| Back to Alphabetical list | Colour photos | Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |