382 CENTRAL MINERAL REGION OF TEXAS. 



Calc-Sinter. Calcium carbonate. 



Common in limestone exposures, as encrusting layers about old springs, 

 often forming psuedo-structural masses and making up some extensive 

 beds of agglomerate and travertine. 

 Carnat. ( Ferruginous Lithomarge.) Kaolinite. Hydrous-aluminum-ferric 

 silicate. 



Edge of Pontotoc, Llano County. Clear Creek, Burnet County (in 

 quartz). High Point, Burnet County. North of Long Mountain, Llano 

 County. San Fernando Creek, below Smoothing Iron Mountain, Llano 

 County. King Mountains, Llano County. Near Field Creek, Llano 

 County. Elm Creek, Mason County. Occurs as crusts on felsite-por- 

 phyries and granites, but is not usually abundant. 

 Cassiterite. Tin-iron oxide. 



Ash Spring, Llano County. Of very doubtful occurrence here, as ex- 

 plained under the heading Tin, in Part II of this Report. 

 Carnelian. (Quartz var.) 



Sandy Creek, Llano County. Pennington Creek, Llano County. 

 Long Mountain, Llano County. 

 Chalcedony. (Quartz var.) 



Northeast Barton's, on Hinton Creek, San Saba County. Cherty di- 

 vide, between two branches of Deep Creek, San Saba County. Deep 

 Creek region, San Saba County (cherty). Layers in chert and flint of 

 the Deep Creek division of the San Saba series (Silurian). 

 Chalcopyrite. Copper-iron sulphide. 



Miller mine, Llano County (with malachite and azurite). Mexican 

 diggings, Babyhead Creek, Llano County. Elsewhere over the Central 

 Mineral Region, but nowhere abundant. 

 Chalk. Calcium carbonate. 



In part of the Cretaceous areas surrounding the region, particularly in 

 the including promontory known as Mason Mountain, in Mason, Kimble, 

 and Menard counties. 

 Chert. (Quartz var.) Silica. 



In the Silurian Beds, upper part Burnet, Llano, Mason, San Saba, 

 McCulloch, Kimble, and Gillespie counties; also in the Cretaceous Beds 

 of Mason Mountain and other districts. 

 Chlorite. Hydrous-magnesium-ferrous-aluminum silicate. 



About three and a half miles south of Enchanted Rock, Llano and 

 Gillespie counties. Honey Creek, Llano County. Little Llano Creek 

 Llano County, etc. 

 Chloropal. Hydrous-ferric-aluminum silicate. 

 Johnson's Creek, Llano County. 



