-
Iceland spar,
formerly called Iceland crystal (
Icelandic:
silfurberg [ˈsɪlvʏrˌpɛrk], lit. 'silver-rock') and also
called optical calcite, is a transparent...
-
variety called "
Iceland spar" is used for
optical purposes.
Acute scalenohedral crystals are
sometimes referred to as "dogtooth
spar"
while the rhombohedral...
- that the "sunstone"
could have been one of the
minerals (cordierite or
Iceland spar) that
polarize light and by
which the
azimuth of the sun can be determined...
- mine,
which is
known for its
Iceland spar, and Stuðlagil. Category:Po****ted
places in
Eastern Region (
Iceland) East
Iceland travel guide from Wikivoyage...
- doubling,
light and war. "Pynchon
makes much of a
variety of
calcite called Iceland spar,
valued for its
optical quality of
double refraction; in Pynchonland...
-
Daniel E . 17
February 2008.
Retrieved December 31, 2010. "Helgustadir
Iceland Spar Mine
Archived 8 May 2019 at the
Wayback Machine" mindat.org Horne, Francis...
-
needles found in sediments.
Other spars can be
found on the tips of
gypsum chandeliers.
Iceland spar Bunnell, Dave. "Pool
spar". The
virtual cave. Retrieved...
-
Helgustadir mine (
Icelandic: Helgustaðanáma [ˈhɛlkʏˌstaːðaˌnauːma]) is a mine in the east of
Iceland where Iceland spar (a form of
transparent calcite)...
-
described by
Danish scientist Rasmus Bartholin in 1669, who
observed it in
Iceland spar (calcite)
crystals which have one of the
strongest birefringences. In...
- India;
white sheaf-like
groups encrust the
calcite (
Iceland-
spar) of
Berufjord near
Djupivogr in
Iceland;
brown sheafs are
found near Paterson, New Jersey...
