4th chakra. Works to heal all issues of the heart; emotional healing.  Allows one to be open to the loving energies of the Universe and others.  Good choice for those who have been abused as children, pink limb cast is very nurturing.  I also feel it is an important stone to heal the inner child, it allows one the security needed to explore feelings on a deeper level; let go of past hurt and turmoil now!  Pink Chalcedony is said to strengthen the arms and legs and to promote flexibility throughout the system. 
 
Numerology- Vibrates to the number 7.   Intellect and knowledge. 
 
Gemological Properties- Pink Chalcedony is actually a microcrystalline or cryptocrystalline quartz. This stone is semitransparent to translucent and is usually seen as light to medium pink.  The chemical composition is SiO2 and is from the trigonal crystal system.  The refractive index is 1.54 and the specific gravity is 2.60.  Pink Limb Cast is actually pieces of wood which were buried by volcanic ash, after much time the buried wood decayed away leaving a perfect cast or impression of the original wood (limb).  Then over a course of millions of years and with the proper mineralogical conditions, the voids or casts were slowly filled with silica/quartz/agate. Source is South Eastern Oregon, USA.