Formula: Na4(Ce,La,Nd,Sr)2(CO3)5
Origin of name: Named for Ole Valdemar Petersen (1939-), Curator, Geology Museum, Copenhagen, Denmark.
Crystal system: monoclinic
Crystal class: 2
Twinning:
Unit cell: a = 20.84, b = 6.374, c = 10.578, β = 120.43°
Colour: Yellow, mauve, gray with pinkish tint, reddish gray
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Acicular crystals and prisms to 7 mm, prismatic
Hardness: about 3
Specific gravity: 3.69
Cleavage: None
Tenacity: Brittle, conchoidal fracture
Streak: White
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 |