THE MINERALOGY OF SCOTLAND. 463 
Minute highly lustrous crystals of this mineral also spangle in the druses of 
a massive granular hematite, which is found at the same spot. 
2. In the Traveller’s Guide through Scotland we read :—“ Beautiful speci- 
mens of radiated hematites are found in the quarry near Holyrood House. 
These are intermixed with steatites, green fibrous iron ore, and calcareous spar, 
forming a very uncommon mass. 
“ Veins of calcareous spar beautifully stripped (szc), also lac-lune, zeolite, 
and amethystine quartz crystals, are met with in many places.” 
These specimens from the Salisbury Crags occurred in fine plumose radiated 
crystals, of a high lustre, and deep brown colour, 
Specific gravity 4° 146. <A little quartz was, however, visible in the specimen. 
It yielded— 
Ferric Oxide, ; : ; F ; 79°015 
Ferrous Oxide, . : : : : aie 
Lime, . : ‘ : ; : “28 
Silica, F : , . ; . 2+ 668 
Water, : ; b : : : 10° 049 
99-199 
Some clear imbedded quartz was visible after the most careful picking. 
The “ green fibrous iron ore ” I can only guess to have been saponite. The 
lac-lunee is rock-milk, an earthy or powdery form of calcite: analcime, Prehnite, 
and datholite were found here when the Crags were used as a quarry, 
LIMONITE. 
1. In my notice of the psilomelane from Hoy, it was stated that limonite 
was associated with the psilomelane ; it is so associated in two of the veins 
only, and its appearance in them is very dissimilar. In both it is superimposed 
upon the manganese ; but in the one it assumes, or rather attempts to assume, 
a minute stalactitic structure ; the individual stalactites sometimes interlace and 
pass into a pseudo-fibrous or knitted appearance. The coating of limonite, 
however, in which this is seen has in itself the usual divergent fibrous growth. 
The fibrous surface is of a purplish-brown colour,.and it has.a certain amount 
of the tremulous lustred and half-scaly appearance of lepidocrokite. But the 
chief feature of this variety of limonite is that its surface, which is dull, has 
invariably a greenish to an ochery tint. When powdered it is ochrey-brown. 
This variety has a specific gravity of 3° 684. 
