A solid padlock...

...and a chain reaction in rust...
A double whammy for the tiny mineral and derelict challenges - triple if you count the music too ;) 
Two reminders:
1. Derelict Hearts and Hon Mentions for DS141 with my blip tomorrow - and don't forget folks, search out some dereliction this week...

2. Blipmeet at the Yorkshire Sculpture Park on Thursday - meet at 11.30 at the main centre - the one near the Underground Gallery ;) Perhaps try and let me know if you are coming, so we can look out for each other?