Formula: (K,Ba)2(Ti,Fe)6O13
Origin of name: Named for John Frederick Biccard Jeppe (1920-), geologist of Nedlands, Western Australia, discoverer of the mineral.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 15.543, b = 3.8368, c = 9.123, β = 99.25°
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Crystals finely prismatic to acicular to 2 x 2 mm, in aggregates
Hardness: 5 to 6
Specific gravity: 3.94
Cleavage: 2; {100} and {20-1} perfect
Tenacity: Brittle
Streak: Pale brown
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |