datolite

Name:

datolite

A photo of the mineral datolite

Class:

Silicates

Chemistry:

CaB(SiO4)(OH) hydrous calcium borosilicate

Color(s):

colorless, white, yellowish, green, rarely red or gray

Hardness:

5 - 5.5

SpecGrav:

2.8 - 3.0

Fracture:

uneven, conchoidal

Cleavage:

none

Crystal:

monoclinic, short prismatic, thick tabular, and unusual porcelaneous nodules from Michigan

Envronment:

Secondary mineral in basalt cavities, serpentinites, and sometimes with zeolites.

Association:

prehnite, apophyllite, wollastonite, diopside, copper, quartz, stilbite, heulandite

Locals:

| New Jersey, Mich., USA | Germany | Italy | Norway |Australia | USSR|

Misc:

The name is from the Greek "dateisthai", meaning "to divide", as it often crumbles easily. Flame test is green, and it is slightly soluble in Hydrochloric acid.

Photos
& Locals:

1.) Caledonia Mine, Ontonagon Co., Michigan, USA
2.) Caledonia Mine, Ontonagon Co., Michigan, USA

3.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper)
4.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper)

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Name:	datolite
Class:	Silicates
Chemistry:	CaB(SiO4)(OH) hydrous calcium borosilicate
Color(s):	colorless, white, yellowish, green, rarely red or gray
Hardness:	5 - 5.5	SpecGrav:	2.8 - 3.0
Fracture:	uneven, conchoidal	Cleavage:	none
Crystal:	monoclinic, short prismatic, thick tabular, and unusual porcelaneous nodules from Michigan
Envronment:	Secondary mineral in basalt cavities, serpentinites, and sometimes with zeolites.
Association:	prehnite, apophyllite, wollastonite, diopside, copper, quartz, stilbite, heulandite
Locals:	\| New Jersey, Mich., USA \| Germany \| Italy \| Norway \|Australia \| USSR\|
Misc:	The name is from the Greek "dateisthai", meaning "to divide", as it often crumbles easily. Flame test is green, and it is slightly soluble in Hydrochloric acid.

	Photos & Locals:
		1.) Caledonia Mine, Ontonagon Co., Michigan, USA 2.) Caledonia Mine, Ontonagon Co., Michigan, USA		3.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper) 4.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper)

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