photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Hajar | all galleries >> Palaeogalleries >> Published Specimens > Fluorite spinel twin, 2 cm on 7 cm specimen. Composition plane horizontal. Naica,Chihuahua, Mexico.
previous | next
25-MAY-2013

Fluorite spinel twin, 2 cm on 7 cm specimen. Composition plane horizontal. Naica,Chihuahua, Mexico.

Contrast this twin with horizontal composition plane between the two twin elements with the interpenetration of the twin elements in the previous image of a pseudohexagonal penetration twin.

Published (Figure 17) in The Mineralogical Record, volume 52, March-April 2021. Smith & Holtkamp, Twinning in Fluorite Crystals.

Sony Alpha 77
1/15s f/20.0 at 105.0mm iso200 hide exif
Full EXIF Info
Date/Time25-May-2013 12:44:39
MakeSony
ModelSLT-A77V
Flash UsedNo
Focal Length105 mm
Exposure Time1/15 sec
Aperturef/20
ISO Equivalent200
Exposure Bias
White Balance
Metering Mode
JPEG Quality
Exposure Program
Focus Distance

other sizes: small medium large original auto
share
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment