Datolite
Datolite is a calcium boron hydroxide nesosilicate, CaBSiO4(OH). It was first observed by Jens Esmark in 1806, and named by him from δατεῖσθαι, "to divide," and λίθος, "stone," in allusion to the granular structure
of the massive mineral.

Datolite crystallizes in the monoclinic system forming prismatic crystals and nodular masses. The luster is vitreous and may be brown, yellow, light green or colorless. The Mohs hardness is 5.5 and the specific gravity is 2.8 - 3.0. 

The type localities are in the diabases of the Connecticut River valley and Arendal, Aust-Agder, Norway. Associated minerals include prehnite, danburite, babingtonite, epidote, native copper, calcite, quartz and zeolites. It is common in the copper deposits of the Lake Superior region of Michigan. It occurs as a secondary mineral in mafic igneous rocks often filling vesicles along with zeolites in basalt. Unlike most localities throughout the world, the occurrence of datolite in the Lake Superior region is usually fine grained in texture and possesses colored banding. Much of the coloration is due to the inclusion of copper or associated minerals in progressive stages of hydrothermal precipitation.

"Botryolite" is a botryoidal form of datolite.
Q706
calcium
Concept
Q618
boron
Concept
Q425597
hydroxide
Concept
Q178977
nesosilicate
Concept
Q706
Ca
Concept
Q618
B
Concept
Q670
Si
Concept
Q629
O
Concept
Q556
H
Concept
Q3353687
Jens Esmark
PER
Q624543
monoclinic
Concept
Q43533
crystal
Concept
Q41472
Mohs hardness
Concept
Q11027905
specific gravity
Concept
Q1973416
type localities
Concept
Q753016
diabase
Concept
Q379648
Connecticut River
LOC
Q57919
Arendal
LOC
Q50621
Aust-Agder
LOC
Q20
Norway
LOC
Q422128
prehnite
Concept
Q424270
danburite
Concept
Q2422385
babingtonite
Concept
Q272844
epidote
Concept
Q753
copper
Concept
Q171917
calcite
Concept
Q43010
quartz
Concept
Q181332
zeolite
Concept
Q1066
Lake Superior
LOC
Q1166
Michigan
LOC
Q764372
mafic
Concept
Q42045
igneous rocks
Concept
Q43338
basalt
Concept
Q1066
Lake Superior
LOC
Q1924035
botryoidal
Concept
Q415059
Datolite
Concept
Q415059
Datolite
Concept
1806-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1806
DATE
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
+5.5^^http://www.w3.org/2001/XMLSchema#decimal
5.5
NUMBER
+2.8^^http://www.w3.org/2001/XMLSchema#decimal
2.8
NUMBER
+3.0^^http://www.w3.org/2001/XMLSchema#decimal
3.0
NUMBER
crystal system
country
located in the administrative territorial entity
country
located in the administrative territorial entity
located in or next to body of water
subclass of