Mineral Information and Data:

Bakerite
Ca4B5Si3O15(OH)5 [CNMNC approved formula]

Named for Richard C. Baker, of Nutfield, Surrey, England, Mining Director of the Pacific Coast Borax Co., who discovered the mineral.

IMA status : Valid species (Pre-IMA 1903) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
54.02.01b.01  
  (54) Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02) with B in [4] coordination
  (54.02.01b) Datolite group (Homilite series)
  
Nickel-Strunz
(10th edition) :
09.AJ.20
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AJ) Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 4.85Å, b = 7.627Å, c = 9.659Å; β = 90.255°
Crystal Habit: Rarely as single crystals, to 0.2 mm, stout, rhombic prisms having oblique terminations or as thin diamond-shaped tablets. As botryoidal and drusy crusts and nodules; most commonly as dense fine-grained aggregates or massive.
  
Color: Colorless to white.
Diaphaneity: Translucent to opaque from clay inclusions
Luster: Vitreous to porcelaneous
Hardness (Mohs): 4.5
Measured Density: 2.88 g/cm3
  
Geologic Setting: As irregular veins in altered volcanic rock (Baker Canyon, Death Valley, California, USA).
Mineral Association: Natrolite, thomsonite (Baker Canyon, Death Valley, California, USA); danburite, calcite, stilbite, datolite, quartz (Charcas, Mexico).
  

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